You brought up some points - If I go to a buffet and spend all day eating there, am I a food squatter? If I spend all day at the cinema watching movies, am I a film squatter?
I would consider you a day squatter only if you parked your rig there early in the morning and then left just so you could hold that desired spot until later in the day. You see this at resorts or cruise ships where someone will put towels on the desirable chairs by the pool or view point but not return until hours later just so they can put an exclusive hold on them.