I would limit tables to 30 minutes for drinks and 45 minutes for food. Ever go into places like Nero and tables are all full with:
Some t wat with a lap top who probably has one coffee in 2 hours
One t wat sitting at a table for four or more
Two women gossiping for hours and have one drink per hour
I would be horrible if I was the owner and kick all these f uckers out for people who spend money and I would ban any t wat coming in from the street to use the loo!