It is good to know that there's a way to earn RC money (up to 2000) while being away from facebook or being totally off line. The game plays itself even when the player is logged off, the only thing is, the game will only earn money and not GP points. to earn GP points, the player have to be online, watching the shop in business.
1) First step is to 'close' the restaurant by blocking the door (this is to prevent popularity from dropping).
2) Then have one cook and one waiter working. Make sure they are at 100% health.
3) Click on the save and exit icon
4) Do whatever you want for the next 1-1.5 hour, like taking a bath and having real lunch which is not twiggy.
5) Log back into RC and claim your money.
6) repeat steps 2-5
Remember to shuffle low health employees with full health employees every hour. Employees at 0% health don't generate income. This method works best when you have 4 employees or more so you don't have to buy food to replenish their health.