Backerkit has a feature called Overtime Mode that engages as soon as the campaign ends. Every time a new backer pledges or an existing backer adds something to their pledge, 10 minutes gets added back onto the clock.
If you can keep the Backer Train going long enough that Overtime Mode lasts for more than one hour, we'll unlock one final community reward: a THIRD sticker sheet, featuring new fan art by Forestghost!