As this ban was set by an automatic grief trap, the duration will not be shortened. It takes breaking at *least* five blocks from within a grief trap to get banned. Grief Traps are very clearly man-made, and our server has strict rules against griefing. I sincerely hope you've learned your lesson, and when you come back on the 31st, you will have made the decision to leave player-made structures alone.
See you next weekend!
Cheers!