Forgot about one more way: Instead of 20 every day you can skip few last unlocks and just reset in 10 hours for 15 or so multiplier. This will allow you to do a single film run too (and previously you could do a 10 hour training session, will have to use 8 hour or 12 hour now), so your girls (only first few though) can gain some progress. Maybe with better stats later you can even fit that 20 multiplier into 10 hour run instead of full day.

I am doing a long run now - instead of resetting in a day, decided to wait few more days for 33 score in some skills, gained at least 6 more new unlocks (3 energy slots from Victoria, few gems) but only 25 to base multiplier. Compared to 20 in a day this is much worse, but it does not hurt much to do it at least once for those unlocks.