Once you have selected a dish, look at the period of time needed for it to be finished. Then minimize your game and go to your phone setting to adjust the time accordingly to the dish period. For example, the time now is 1300 and the time required for the dish is 30 minutes, now adjust your time to 1330. Go back into the game and your dish is done. With this you could skip the pending time.

Note: Don't use this method too often, by doing this frequently, may result of blacklist in online mode and also suspend from playing. Use this cheat with your own risk!