Along these lines, there should be more "creative" detentions used at Hogwarts. Have the transfiguration professor turn your student into a mouse for five hours so that they can get into the crevices of the classroom and clean out all the crumbs. Have said student be chased by someone's cat during the middle of their detention and then get no sympathy whatsoever from the professor, just a 'Well I hope you still managed to finish it all, otherwise I'll see you back tomorrow night.'

Accidentally knocked over a fragile plant in herbology? Your student can carry around the seeds for the next two weeks to incubate them and get them ready to be planted. They require an hour of direct sunlight a day, regardless of the weather, and scream if they get too cold. Have fun with that.

Care of Magical Creatures detention? Wrangle up the knarls and clean out their bristles with a toothbrush - careful, though, they don't like it and you'll likely end up covered in quills by the end of the day. Hopefully you aren't allergic.

In trouble for spreading rumors about one of your professors? Enjoy a few days wearing an amulet that grows heavier and heavier with each lie you tell.

/etc etc