[Grim_]

You could do this without a timer by using Unix timestamps. You can find a real thorough tutorial on them here: https://sampforum.blast.hk/showthread.php?tid=254915

You would store the value of the timestamp the first time the player succeeds the command. Then every time the player types the command, check the current stamp - the variables value, and see if it's greater than the time you want them to have to wait. If so, they can use the command again.