I’ve come to hold the opinion that a precise schedule makes you a very fragile person. One aberration in your day, one missed task, one job that takes longer than you planned, and your whole schedule is thrown off.
If you’re already fighting procrastination, you will use any excuse for laziness you can get your hands on. So don’t build a tight schedule if you’re trying to break out of a creative slump.
Build loose blocks of time where you can swim and bounce around in a proverbial pool of ideas and if you spend five hours and only manage to answer one email, fine. Set aside another block of time and try again.
Don’t be a control freak with your time and you’ll get more out of it.