Leaderstat Value Won't Change?

I made this script which waits 60 seconds, then increases a leaderstat value by 1. But for some reason nothing happens to the value, and I don't get any errors on it. I feel like the answer is obvious but I have no idea how to fix it. Here's the code:

wait(1.5)
function Min(NP)
	while true do
		local Stat = NP.leaderstats["Minutes Played"].Value
		wait(60)
		Stat = Stat + 1
	end
end


game.Players.ChildAdded:Connect(Min)

I've also tried making it a StarterPlayerScripts script and the same thing happens, code below.

wait(2)
while true do
	wait(6)
	script.Parent.Parent.leaderstats["Minutes Played"].Value = 
        script.Parent.Parent.leaderstats["Minutes Played"].Value +1
end