Where are banning times defined....

[mike2902]

Where in the code are the times for banning defined. Currently there are multiple lengths of banning available, 1 day all the way up to perma. I would like to try to add shorter bans. Like 5 minutes, 15 minutes, 1 hours etc. So where is the banning times defined so I can look to see if I can add these custom times.

3.8.2