It glitches like that sometimes. You can ban someone for an hour and it will come out as a day it's happened to me when I got banned from teamspeak a while back as a mod. The ban was oy supposed to be for a hour then it was a day.

And in my opinion this was a stupid thing to do I mean think before you act, if he understood you what do you think the concequences would be. You were an ex - staff you should know better.