how do I make a cool down

[fleet python]

I'm trying to make a cool down for a canon/rocket in my game it's going to be like a sea of these type and I don't know how to make a cool down I need help the main reason I'm asking this is because I'm kind of new to CV2

The main theme of the game is a sea of Thieves type what I said and the reason I'm trying to do this is cuz I'm trying to make it so when you go to the bottom deck and grab a rocket go up and put it in and whenever you click up on it launches but it'll be a certain timer until you're able to put another one in and launch cuz I don't want people spamming Rockets