Check out the app Sorted on iOS (not sure if on Android). You can set all your tasks for the day and all their lengths (great for timeblocking), a default buffe

Check out the app Sorted on iOS (not sure if on Android). You can set all your tasks for the day and all their lengths (great for timeblocking), a default buffer between each task, and then autoschedule all the tasks throughout the day. If one gets interrupted, you can re-schedule them for the rest of the day after a certain time.