Sam Corcos possesses a number most founders don’t: 17,784. That’s how many hours he logged into creating his company, Levels, over the span of five years. He tracked every single one of those hours on purpose and published the breakdown publicly. During his hardest fundraising stretch, he worked 110 hours in a single week. According to the log, he hasn’t had a month below 50 hours in over five years. By every other hustle-culture measure, that should be a burnout story. Instead, he attributes his stamina to a single, ruthless habit: pouring energy strictly into work that fuels him while cutting tasks that drain him.
The distinction in cutting energy-draining tasks for those that energize is the habit worth learning from, rather than focusing on total hours logged, which is what many founder-aspiring students tend to obsess over.
Here’s the key piece of data that should help reframe the whole picture: a Stanford productivity study found that output plateaus after about 50 hours a week. Founders who were clocking in 70 hours were getting similar outputs as those clocking in 55. This shatters the commonly held idea of the successful founder being the person who’s in the office at 2 a.m., grinding past everyone else. Instead, the research
says past a certain point, that person merely accumulates hours to produce the same output, suffering from diminishing returns.
That distinction matters because blind hustle comes with a massive, measurable toll. When students treat relentless grinding as a badge of honor, they copy a lifestyle that frequently leads to burnout. UCSF psychiatry professor Dr. Michael Freeman highlighted this in a study comparing entrepreneurs to a control group of demographically matched professionals in traditional corporate roles. His research revealed that founders were 50% more likely to report a mental health condition, with 30% experiencing depression compared to just 7% in the control group.
A 2025 survey echoed the exact same reality, finding that 83% of founders report high stress and 55% struggle with insomnia. The numbers prove that the primary driver of founder burnout is unmanaged boundaries. Building something real requires sustainable limits, not reckless endurance.
So what do the founders who actually sustain the work for years do differently?
They batch the reactive work, so real work has room. Corcos’s method is specific: cluster meetings together instead of scattering them across the day, so large, uninterrupted blocks of time remain open for the work that requires increased focus: writing, coding, and strategic thinking. Most founder days are dominated by small, unplanned, reactive tasks: emails, Slack messages, a customer complaint, a scheduling back-and-forth. Though unglamorous and rarely highlighted in founder stories, these administrative micro-tasks quietly consume the majority of a workday. To contain the noise, they treat these micro-tasks the same way: setting dedicated windows for communications rather than responding in
real time. A habit like this is key to a founder’s survival and to containing these interruptions, refusing to let reactive work take over every hour.
They track where the hours actually go, instead of guessing. It’s very easy to feel busy without being able to say what the busyness produced. Corcos’s whole project, publishing five years of tracked time, exists because most founders never look closely enough to know if their calendar matches their actual priorities. Though intimidating at first, you don’t need a five-year spreadsheet to borrow the habit. Even just a single week of honestly logging where the hours went is usually enough to reveal the gap between “I’m working constantly” and “I’m working on the right things.”
They treat energy, not hours, as the resource to budget. This distinction is what kept Corcos’s 110-hour workweeks from becoming a story of burnout. Ten hours of draining, reactive work will grind a founder down faster than twenty hours of deep, engaging focus. The real habit isn’t necessarily working less; it’s being honest about which tasks rebuild energy, then protecting those habits when stress peaks and structure is most tempting to abandon.
They build in recovery on purpose, not as an afterthought. The founders who avoid the worst mental health outcomes aren't the ones who happened to get lucky. Given the staggering rate of stress, anxiety, and depression in startup founders, treating recovery– sleep, genuine time off, real human connection– as a non-negotiable habit isn't being soft. It’s simply applying the same discipline to a different input.
These habits look nothing like a cinematic montage with 5 a.m. routines, green juices, and high-stakes pitches. The habits that sustain a founder under real pressure are quieter: containing disruptions, managing energy instead of hours, and treating recovery like a core operational cost. Corcos didn’t avoid the 110-hour weeks. Instead, he built habits and a schedule that let him survive without burning out for his next five years.
