There are a lot of factors for when people that had been in their house prior to 3.4 (when the auto-demolish was stopped) and had a full 45-days on them. I'd assume Friday morning at the earliest, yet with all the maintenance, it is quite possible that it is more like Sunday. We don't even know when they actually begin the timer again. It is from when the server comes up? When players can log in? It is too much to guess. But, I'd put even money on Sunday.