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I second the "don't invest in unit range"  because of AOE will hit the factory. You want your units to move in to build distance.    Maybe base and factories should have a significant splash damage reduction. Cheers!

There is no timer. My guess is a bit more than one hour?

With my gamer mind, I realise I can move factories as soon as we have enemy form both side. However, there is no room for moving in the later game:

If I move to the enemy , nothing changes;

If I move to the base, the AOE damage my base too;

If I move the base to up or down, half of the enemy would attack the base directly.