I left the watch outside for 30 minutes running the GPS Info app. The app keeps the watch on and it doesn't go to sleep. When I returned it had a fix. I don't know how long it took as I just left it there. So it looks like the cold TTFF is quite long.
As for indoors, it seems to be a bit hit and miss, which is probably expected. I think the fix jumps around a lot as the app is reporting my speed as > 2 km/h!!!
You can mark this is SOLVED/CLOSED/WHATEVER and maybe you could add this information to any FAQ you are working on.