It would only be mandatory if you didn't visit the place in a long time. But a lot of servers delete claims after a month (or 3) absence (unless prior notice vacation/sickness/...) because it gives to much lag or is to intensive for the working of the server; mostly small servers managed and paid by one or few players. The maintenance of the build could signal activity.
I believe there are more direct tools to find out about players inactivity.
Either way, this ideia may not be suitable for the official game, but surely would give a good mod. And it could be done, considering the plug-in API the game has is quite powerful.