Extend the 15 mins server update message to 30 mins

[Synergia]

Hey when we have a big event such as temple event, and I am playing the event for 1 hour for example and then the 15 mins server restart showing up, its really annoying
please make it a 30 mins so less work and will go down the drain.
I imagine that 1-2 hours will be too hard but if it is possible to give us 1 hour notice before update - even better