If it is a quiet night, there is nothing wrong with "lingering". On a busy night with a line out the door, it becomes a matter of common courtesy. There is so little of that at the lake these days, it is concerning. Restaurants can not predict the waiting time for patrons when tables are in linger mode. When you are at 2x the predicted wait time, it is difficult to not notice the lingering tables.
Just because you pay for a ramp fee, doesn't mean that you should mess around on a boat ramp and block other people. The same applies here. On a busy night, people want to typically get in, eat and move on. The restaurant wants to turn tables (that is how they make their money) especially with a seasonal business. On a quiet night, go for it.
We are mindful of not lingering on busy nights. Again, this all goes to common courtesy.
Jetskier