I was buttoning up my base right before horde on day 14 and placed a wrong block. The entire thing dropped... with 10 minutes until 2200. I'll be honest, I quit out like a coward and I haven't been back....
Minecraft and such are misleading. Weight added to suspended portions (crafting stations, crates, etc.) stresses the supports, even when they seemed otherwise fine during initial construction. If any of those supports break, well, you know.