I am making a Tycoon and Need help making a Delete OnTouch script, can you help?

I am making a tycoon and I need help on a simple script, but yet a Novice at scripting. I have the tycoon starters that drop the money bricks but I need help on a script that makes them disappear after a bit or go away when they touch the ground. I need help to make this script because I dont want a game lagging out because so much of the bricks are on the ground. Please help me if you can! :)

time = (time you want it to wait before disappearing in seconds)

Part.Touch:connect(function(hit)
	if(hit.Name=="BasePlate") then Part:Destroy() end
)

while wait(1) do
	time = time - 1
	if(time==0) then Part:Destroy() end
end