As far as I can tell you can only set 2 times and repeat them over numerous days. Might be worth emailing the app creators and ask they’re pretty good at replying.
As for setting the cabin 10 mins before leaving yes that works for comfort of course and for one off trips it’s fine but regularly leave the house like me Monday to Thursday at 7am to take my son to the college bus its just so easy plus the departure time also preheats the battery which turning climate control on doesn’t do (I think).
Anyway no right or wrong everyone just uses whatever feature suits and when. I have noticed using departure time that even in the cold weather we just had my economy was still 3mi/kwh