A day counts when everything scheduled for it is ticked. Dev Block and Music Block rest on Saturdays and Sundays, and Gig Hunting rests on Sundays, since the weekend is for preparing for and playing at service. Fitness counts a gym session or a home workout. Earlier days stay open if you need to catch up, and later days unlock on their own date.
Each bar is a week, as a percentage of the ticks scheduled so far. The number under it is that percentage.
A setback day is a day with a note that was not fully ticked. It counts in your totals like any other day, and the note is there so you can see why. The record is a spreadsheet file (CSV) with every day, every habit and every note. Download it every few weeks as a backup, and again on 31 Dec for your final review.
Tap a date to add a note about that day, such as a setback.