Is it OK to ask restaurant guests to leave for incoming reservations?
Susan Jung ponders a matter of dining etiquette that generates a lot of heat in Hong Kong, and elsewhere

Recently, I went to review a Cantonese restaurant in Causeway Bay. Our attempt to reserve a table for 7.30pm had been rebuffed, as the restaurant was fully booked, but we were told we could be seated at 6pm if we agreed to return the table at 8pm.
That was fine with us. We arrived on time and had a good meal served at a reasonable pace. At about 7.45pm, the manager asked if we wanted to order dessert, but also politely reminded us that the diners for the next seating were due to arrive. We paid and left, feeling satisfied.
Diners have given anecdotes.
In one incident, a party of eight, upon arriving for their 6.30pm reservation, were only then informed that they had to give the table back at 8.15pm. It wasn't an inexpensive restaurant - they were paying US$60 per person. There was a long wait between courses, but this didn't stop the manager from asking them to leave when the time came.
Another poster writes that a group of 16 had to wait for two hours after their reservation time because the party ahead of them lingered for so long, while the staff did nothing.