I got 2, each for forgetting white socks for PE. Literally never spoke about them again after I did them. Straight up forgot they even happened after a while.
I got one in PE in Year 7 and then another one in PE in Year 11. Are detentions really a big thing?
Nah, not really. They are quite annoying as you waste around or at least half an hour of your own time, however getting a couple on the whole is alright.