add a break feature - you will be able to pick how often do you want to take breaks. When you will work, Sunsama will remind you to take a break when it's getting close to the time of break. Example:
sets to take a break every 30 minutes
,
does task1 for 16 minutes
(the actual time the task cost to finish),
does another task2 for 10 minutes
,
sets that task3 will take 15 minutes and opens it
,
gets reminded to take a break and to start doing task3 after a break time set earlier