Energy Management vs Time Management: A Field Guide

You can manage your calendar perfectly and still be exhausted by Thursday, which is exactly the trap most founders I know have fallen into. The calendar is optimized, the focus blocks are protected, and by Thursday afternoon they're gassed anyway.

Years ago, on a Monday morning, I sat down to plan the week ahead. Five days later, on Saturday, I flew to Brazil, through Atlanta, for a little over a week, where my team and I ran our first international event.

TL;DR: Time management decides where your hours go; energy management decides what condition you are in when you spend them.

I did what I always do. My workweeks start and finish the same: with a comprehensive calendar review. I look at my currently scheduled obligations and then pad accordingly. Work blocks: based on the prep, I've set aside blocks of protected focus time. Travel blocks are mostly a warning for me, so that I don't schedule a call in a window where I'll be on the road. Personal blocks: during weeks like the Brazil one, I take extra care to build in windows to proactively recharge.

I think about my personal energy as I would a bank account. On weeks like that one, where I'm making more withdrawals than deposits, my goal is to replenish my energy before I realize I'm running low. The clock tells me where I need to be. The ledger tells me whether I'll be any good when I get there.

The Condition You Spend Your Hours In

The framework that gave me language for this comes from Jim Loehr and Tony Schwartz, who laid out four dimensions of energy, physical, emotional, mental, and spiritual, in their 2001 Harvard Business Review article The Making of a Corporate Athlete. Schwartz returned to the argument with Catherine McCarthy in 2007's Manage Your Energy, Not Your Time, and Schwartz's broader work has spent decades on the same premise: energy is renewable, and renewal has to be deliberate.

The four dimensions are the researchers' frame; I use three of them, everything except the spiritual, which I've parked for a piece about what downtime is for.

The Calendar as Ledger

Mental energy is about switching cost, and this ruleset costs me spontaneity and the occasional booking I have to turn down.

• Never have a phone call before 10 a.m. or after 3 p.m.
• No calls on Monday or Friday.
• Never more than four calls in a day.
• Always 12+ hours' notice when scheduling, and no same-day requests.
• Leave 15 minutes between calls.

Sometimes I book three weeks out for a morning call, which can look precious from the outside. I'm protecting my energy. The research world has its own version of this argument: K. Anders Ericsson's work on deliberate practice found that elite performers train in bounded bursts of intense focus with real rest between them, and the contested literature on ego depletion, which treats willpower as a finite resource (an idea the replication debate has since complicated rather than settled), points the same direction: cognitive output carries a cost curve of its own, separate from the clock.

The practice that taught me my own cost curve is the energy audit. Every hour, on the hour, assess your energy and focus on a scale of 1 to 10, with 1 being lackluster (a case of the Mondays) and 10 representing you at the top of your game. Track this way for a week, and repeat the process once every four to six weeks. After the first few days, patterns emerge. Perhaps you're most productive in the mornings but practically useless after 3 p.m. Then adjust your day so your most important tasks fall into your peak hours and your least brain-intensive tasks land in your less-productive hours. I've noticed that when I honor my focus and creativity limits, I consume less caffeine.

Emotional energy is inventory work. I take emotional inventory in the morning and evening. I ask myself how I'm feeling, mentally, physically, and emotionally, and in the evening I review the day to see what, if any, activities contributed to these feelings. Pre-pandemic, this practice caught a real pattern: if I commuted across Los Angeles too many days in a week, I felt less resilient, creative, and rested. Even as a passenger, I felt worn-down after the commute. I scheduled my weeks so I crossed town no more than three times. I've also learned to ask which stress is worth it. Sometimes it's a yes/no question: what does this cost me against what it gives back? Other times I dig deeper: what about this situation supports or nourishes me, and what about it drains my energy or resources? A quick check that helps here is the HALT method, which asks whether you're Hungry, Angry, Lonely, or Tired before you trust your own read on a situation.

Monday Sets the Week's Balance

The ledger scales up from hours to days. Lately, my Mondays have been all about creating momentum, sparking action after a weekend away from business activities. Mike and I wake up early and complete our coffee meeting before 7:30 a.m., which includes a review of the week's calendar. The first activity of my workday is an energizing activity or conversation. I keep 60 to 90 minutes of unscheduled morning time to set priorities for the day and week. I've identified the three most valuable results I can produce this week and protected time at home to focus on them, and I've cleared at least one hassle, typically by rescheduling or building in more buffer.

Going too hard is the subtlest Monday mistake. I'm discovering this day has a delicate balance. On the one hand, I want to nudge each project forward to create momentum. On the other, I want to manage my energy so I have enough fuel in the tank for my big productivity days on Tuesday and Wednesday. If I exhaust myself on the first day of the workweek, I'm much more likely to feel pooped by Thursday.

Recovery as a Deposit

The week after Brazil tested all of this. Throughout that week, I had to be realistic with my abilities. It's uncomfortable for me to admit to my team that I'm working more slowly than usual, or that I can't participate in a conference call or need to reset a deadline, but not doing so hurts the team more than it helps. I told my team, and I skipped or postponed the nonessential meetings, deliverables, and deadlines. By regularly checking in with myself on what's possible, and asking, "What would support me right now?" I felt empowered.

Physical energy is the baseline, and for me it's mostly sleep. My husband Mike and I keep an evening device boundary, and we wake up on our own without an alarm. I need at least an hour between finishing work and going to bed, or my mind races. My sleep was better, and I woke up feeling ready to attack the day, a remarkable change from how sluggish and pooped I felt a week earlier. Your body runs on circadian rhythms, the roughly 24-hour cycle the National Institute of General Medical Sciences ties directly to sleep, hormones, and alertness, and within the day your alertness also rises and falls in ultradian rhythms of roughly 90 to 120 minutes. Sleep itself is when the body does its deepest repair work, per the Sleep Foundation, and shortfalls accumulate as a debt you eventually have to repay, which Harvard Health documents in detail.

Recovery takes several sizes. After a few consecutive days of being visible and in demand, I almost always schedule a few days of unplugged downtime so my body and brain can reset. A 10-minute nap resets me completely, while a 30-minute nap usually results in me setting my alarm for another 30 minutes (the shorter one wins, every time). The evening boundary from earlier keeps that hour clear every night.

I also watch the small physiological tells. When I'm focusing on computer work, I tend to breathe shallowly and forget to breathe deeply. Catching that is its own kind of hourly audit, a withdrawal I can reverse in 30 seconds.

When I follow my own rules and use my calendar to manage my day, I feel relaxed, poised, rested, and, above all, ready for anything. My current 3.5-day workweek runs on exactly this system.

Frequently Asked Questions

What is the difference between energy management and time management?

Time management decides where the hours go. Energy management decides what condition you'll be in when you spend them. A perfect calendar can still leave you gassed by Thursday if the ledger side is ignored.

How do I run an energy audit?

Every hour, on the hour, rate your energy and focus on a scale of 1 to 10. Keep it up for a week, then repeat once every four to six weeks.

What are the four dimensions of energy?

Loehr and Schwartz describe physical, emotional, mental, and spiritual energy. In my own week I work with three of them: the physical side is mostly sleep, the mental side comes down to switching cost, and emotional energy becomes the morning and evening inventory I take.

Why protect Mondays so aggressively?

Monday sets the week's balance. Starting with an energizing activity and unscheduled morning time creates momentum, while client meetings and cross-town commutes on Monday tend to drag down everything that follows.

How long does recovery actually take?

It scales. A 10-minute nap resets me on the spot, while a stretch of high-visibility days calls for a few days of unplugged downtime afterward.

So: what does your energy audit say your Thursday has been trying to tell you?