Bar & Grill table etiquette.....(please read details)

How long is too long to occupy a table at a Bar & Grill?

We went to a Bar & Grill yesterday to kill some time while our daughter was at a swimming/ birthday party at a hotel. The hotel was 20 miles from our house, so we thought that having an early dinner and a few drinks at the Bar & Grill next door was our best option to kill time.

It took an hour to order and eat. We still had 30 minutes until we had to get our daughter, so I nursed my beer while my husband had a couple more. A couple sitting in the bar area waiting for a table kept glaring at us. It was getting very annoying receiving such hateful looks. If we had more time to spend there I would have ordered more beers, just to spite this lady.

What is an appropriate time to sit at a Bar & Grill? if there is any