plan the time without living inside a calendar.
Estimated completion time
Add a realistic estimate to something you need to do, from a quick five minutes to a custom duration.
Pomodoro timer
Open a full-screen focus timer that puts the current thing in front of you and lets everything else disappear for a while.
Calendar when you want it
Use a simple seven-day list or a monthly view that shows which days are open and which are getting crowded. Close it when you are done looking.
More useful time choices
Attach a time to important dates, shape morning, afternoon, and evening around your day, and make room for breaks inside longer things.