The ban was meant to only be 14 days, so yes, it was a typo on my part.
I ban block damage as the following:
1-20 Blocks: 1 day
20-40 Blocks: 2 days
40-60 Blocks: 3 days
60-80 Blocks: 4 days
80-100 Blocks: 5-7 days depending on severity
Etc.
So 288 blocks should have been 14 days.
If you are not online to defend yourself, I wait for appeals such as this. Mods do have typos and make mistakes, so thank you for bringing this to my attention and my apologies.
You seem legitimately sincere, so I will lower the ban to 3 days. If you were online at the time I would have made you fix the damage, but it is already repaired. I do not feel it would be fair to let you get off with a slap on the wrist, so I'll reduce the time to three days. When you return tomorrow, please make sure you have re read the rules and don't let something like this happen again.