We have sceduled breaks (like between the fish and the soup), so they drift away. All told, meals take about 2-2.5 hours, so with the 20-30 minutes away in between, its not so bad.
During the week, supper goes much faster (under 20 minutes)so I do draw the line about texting / taking calls at the table. None of us are hatzoloh drivers, so the phone gets left in the room / gets answered by the answering machine