What is the most difficult part about managing your time in a startup?

Context switching. It is very easy to see a lot of tasks and understand that you can plausibly do all of these in 4 hours but not many people think of the time it takes to change tasks and get in the right mindset. Another one is that if you work with people sometimes they need things from you and that is even more context switching. I think it is important to give yourself a little breathing room in your schedule to make sure you can deal with things that come up while still reaching the goals you set out to