Structure Decay Rate :/

Playing on official PvP. When you equip a repair hammer it displays a timer that says the current structure decays in x:x:x mine saying it decays in 144 hours.

Whats the point in building a base if its going to decay in less than a week? Surely structures should only decay if the players who own the structures never play on that server or use that base anymore.

I think there is a bug in the Decay system. A few says ago on a private server I was on, every player either in a small clan or no clan had their house suddenly explode. I was standing in mine when it happened.