When I was younger, a large number of parishoners would go up for communion and then walk right out the back door... before the mass has officially ended. Yesterday, we attended a local parish that isn't our normal parish. I noticed a handful of people doing this. I've also noticed a decent number of people that show up really really late - like just before communion. My question is:
Do you still get credit for your Sunday obligation if you leave before the mass has ended or arrive very, very late?