It was a couple hours. Just like on my desktop, wiggling the mouse wakes it from sleep, but not so in whatever that second state is when it’s left for longer. It definitely was something other than sleep. What it was - I’ll let you guys decide. Whether it behaves long term with fans in a laptop bag, that I don’t know - I haven’t had enough run time with it.
I’m just sharing a positive experience. If I see it misbehave I’ll be sure to update the thread with reality. But so far, it really is behaving much better than I expected.