for a decent standard game, I like to play Game/15. 15 minutes seems to be popular.
Time in Live Chess?

Sometimes I don't have 15 minutes to play a game. Have you ever played a "blitz" game of 5 minutes or less? Sometimes that works for me.

You can play anywhere from 1 minute per side to over 2 hours. There are time controls with increments or delays. You can play games with multiple time controls, adding time after certain moves are reached.
There is no "right" time control.
Just a question to consider: How much time should each player be given in a game of Live Chess? Personally, I do better in faster paced games but they can't be so fast that I can't think before my move.