The more points is donated the longer wating time will be garantied.

I tried to get 1:30 waiting time with just 1 candy. So you can get 1:30 with items worth between 2 to 2000 points.
As players almost alwasy get a waiting time equal the the minium garantied the points when garantied waiting changes that are interesting.

The more points is donated the longer wating time will be garantied but longer waiting time sometimes get longer.
Longer waiting times normaly give other rewards and better rewards than shorther waiting times.

I tried to get 1:30 waiting time with just 1 candy. So you can get 1:30 with items worth between 2 to 2000 points.
As players almost alwasy get a waiting time equal the the minium garantied the points when garantied waiting changes that are interesting.
7
1x R-Gacha garanti 0:50
2x R-Gacha garanti 1:00
3x R-Gacha garanti 1:30
5x R-Gacha garanti 2:00
7x R-Gacha garanti 2:30
10x R-Gacha garanti 3:00

Very few players donate more than that and I can remember anyone who get anything good from donating a lot other than the limmed SR-Girl.
I cant remember getting anything wothwhile for donating less than a R-Gacha.