Schedule automatically in my available time

Automatically break my free time apart (based on a calendar feed for example) and ensure I take breaks. 

If I have 1 hour to focus: give me 25-minute work periods with 2, 5 minutes breaks
25 | 5 | 25 | 5

or 20-minute work periods with dynamics breaks
5 | 20 | 5 | 20 | 10