Our party of 7 (including 5 teens aged 11-18) liked Mythos very much. We had appetizers, entrees and dessert and it took us a total of 90 mins, but would have definitely taken less time if we hadn't ordered the 3 courses. We found service to be very efficient without feeling rushed.
(BTW - there is plenty of food w/ just the entrees, but we have 4 boys who tend to eat light at breakfast and are ravenous at lunch hence the 3 courses).