Just cut the timers on everything by 2 - done
Instead of wasting 24 hours waste 12, its more than enough to prepare for and against the siege, to have possible fight against siegers or defenders or just simply to call for help(fyi hermits - all kingdomn fighters always willing to fight and protecc their allies(if they are not pussies ofc)). And by cutting everything in a half i mean litteraly EVERYTHING - drying of rams\catas, repair times of them, etc
https://www.reactiongifs.com/r/2013/10/tim-and-eric-mind-blown.gif