after nigth 1 (if you need repair wall)12 hours loocking for ppl after nigth 2 same do this untill you have find the sniper after that look for wopens and repair wall if you need if you do this you will finnish it in no time
This is a bit easy, btw there is a glitch, if u have a automatic firearm (chainsaw works as wel) keep firing when you swap to another weapon, now the glitch is with the shotgun and the last 10shot sniper, it fires all the bullets as if it were a machine gun