I'm glad there's been a lighthearted set of responses on this topic but let's keep it, for now, to the idea that God DOES exist.
SOOO What the heck does He do with His time ?
What time? I'm not up on Hindu theology, or much animism, but I'm presuming the question is primarily concerning the Abrahamic deity anyway so...
If God exists outside of the universe, time as we experience isn't something that happens. God is aware of the entire timespan of the universe, because time is simply another dimension that already exists in its entirety. We experience time from our limited view of that one dimension as we move along it, inside the universe.
Outside the universe, our time isn't there, it's a facet of the universe we exist in, that God - already extant - created.
Obviously, not my personal view, just the conclusions of Christian theology, so far as I've managed to understand it.
O.