Not playing but still at table

was wondering why in ring game people are allowed to stay at the table so long after they,i guess i’ll call it standing up, but not actually leaving table…when you get 2 or3 people taking up a spot and people waiting to play it kind of ruins the table…i can understand 2 or 3 hands going by to let them back in. but seems like 20 or more…i personally think its rude and maybe its just whineing on my part but it is ring games not tournamrnts i’m talking about…people dont need to be so rude