sometimes into the post office, when I'm only going into the lobby to retrieve my mail from my PO box
any other time, it comes off, if I'm going into a convenience store, it's only to grab a snack that my helmet has to come off to eat.
in Ironbutt rides, every gas stop, my helmet comes off, to pay in store, I get off to stretch my legs and jaw, makes the next 3 hours more comfortable. I'm not one of those riders that pulls up to a pump, sticks his card in and gasses up without getting off
if for one reason alone, I have personally observed gas spillage and fire, the rider was lucky, there were a couple people (closer than me) to pull him away and get the fire suppression going. He got away with singed gonads, no, not for me, a lesson learned by someone else's mistake