today i had to serve a saturday detention and it was HORRIBLE, do you think i deserved it ?

i have just got home from serving a 4 hour saturday detention oh it has hard very hard we had to wear full school uniform white shirt, black skirt school tie and black blazer, we had to be in school at 9am for FULL school uniform inspection, then we had to sit at our desks in TOTAL silence and write a 4 page punishment essay after 2 hours got allowed a 15 minute break then back to our desks , then copy out our punishment essay, , at 1,15pm tidy classroom then go home, i think its cruel to keep a teenager in on a saturday its SO SO wrong.

MY CRIME , last week i had a reguler detention for 1 and a half hours, i couldnt be bothered to go as detention is for losers, the next day my head of year said skipping detention is NOT an option SATURDAY DETENTION , is this fair ?