The flight attendants/safety card will tell you to stay buckled whenever seated, even if the seat belt sign is off, but many (most?) people will ignore that guidance and stay unbuckled for as long as they are technically allowed.

Only aviation professionals or recovering flight phobics like me who have watched every episode of Air Crash Investigation will take proactive safety measure of their own accord. To normies it's all just a pointless hassle.

I stay buckled and I’m just a “normie” not afraid of flying that understands turbulence doesn’t always happen in a bell curve with some notice. Not sure if that makes you feel any better? :)