You will get lots of answers. I have two depending on if you have a reed valve breather. With a reed valve breather I don't even look I just start the bike. Yes, there a chance that the main seal could still be pushed out, which would be a PITA, but I don't consider that very hard to fix and it's never happened to me. Without a reed valve breather, I drain the sump if I can see that the oil in the tank is down to the screen.
One of my bikes wet sumps fully in two weeks another in around 5 weeks. Both have reed valve breathers and I simply start them.