User blog comment:Glaerdir/I banned WarPig for 2 days (or less)/@comment-25330335-20150924011514/@comment-27723099-20150924162431

Yes, you can only set it to 1 or 3 days if you use the dropdown menu. But you can just enter a custom time in a similar format as shown by the dropdown items, eg. "2 days". The time input parser seems to be quite good.