I like to have 5 of each person working for each click.
Eg, 5 cooks/waiters/deliver guys working 0-3-6, 5 working 3-6-9, 5 working 6-9-12
And have it closed for 3 hours (1 square) when there are few people around the branch in the city
hmmm... I never care about hygiene. That part of the game is so unrealistic. No one would make a big mess like that, and it could be cleaned up while the restaurant was open.