25 individual infractions total, and you get an automatic permanent ban. No other automatic ban is given based on the amount of infractions you have. Warnings don't count.
The only temporary bans are given from 9, 15, and 18 active points, or a ban issued by the higher staff. I'd imagine if someone managed to get more than 15 individual infractions, they'd just be brought up for permanent ban before they can make it to 25. Nobody should be getting that many infractions, whether they think the staff are a bunch of tyrants or not.