cmad1977
Hero
I don't know if it really "wastes" time - but about every other session there is a point where some rule comes up we have not dealt with yet or often but that seems like it might - so I insist on looking it up - but the 5E PHB index is SO FRIGGIN' TERRIBLE I struggle to find it. Seriously, I get mad whenever I look at that index.
Other than that, sometimes when we first get started we run a little slow because folks are having a smoke outside or my wife (who does not play) is catching up with one of her best friends (who does) or folks have to seek out where the pets are hanging out in the house to give them pets and scritches.
However, overall? This is the most focused group I have ever had the pleasure to run for.
Don’t look up rules in play unless someone’s life is on the line. Make a call and look up the rule afterwards, amending things if necessary.