Enough coats until you see proper even coverage. I cannot remember how many mine took,but it was definitely 3 or more. Wait time according to instructions on the spray can is 30 min. minimum between coats, double check instructions listed before use.
You want the first coat to be light, basically spray it as a mist on there without covering everything with the new color, that`ll give you a better foundation for the following coats to stick better.
edit: I just followed whatever was on the label when it comes to wait time, the time mentioned above by Sizzle Chest works too ,with thin coats like he states. I applied mine thicker,hence the longer wait time.