Help making my countdown timer GUI more efficeint?

minutes = 2 -- Sets initial timer
seconds = 0

while minutes > 0 or seconds > 0 do -- If timer has time, loop
	seconds = seconds - 1
	if seconds < 0 then -- once seconds have run out, reset seconds and lower minutes by 1
		seconds = 59
		minutes = minutes - 1
		print("1 minute passed")
	end
	wait(1)
	print(minutes, seconds) -- sorry, I couldn't make it fancier
end

print("Achievement get: 2 minutes and 0 seconds wasted") -- Run code when timer runs out

This creates a pretty easy minutes, seconds timer. Optionally, you could only input seconds and divide to get the minutes, seconds.

seconds = 120 -- Sets initial timer

while seconds > 0 do -- If timer has time, loop
	seconds = seconds - 1
	print(math.floor(seconds / 60), math.fmod(seconds, 60)) -- math.floor() returns the minutes. It divides the current amount of seconds by 60 and cuts off the decimal. math.fmod() returns the seconds. It returns the remainder of seconds divided by 60.
	if math.fmod(seconds, 60) == 0 then -- if seconds divided by 60 = 0, print the message. In other words, there are 0 seconds, a new minute started.
		print("60 seconds passed")
	end
	wait(1)
end

print("Achievement get: 120 seconds wasted")

To make the timer reset, you could put the entire thing in a while true do end loop. Whenever the timer is done, it will reset automatically

Also, as TheeDeathCaster mentioned, you could easily just use a for loop for casual purposes.

for seconds = 120, 0, -1 do
	print(seconds)
	wait(1)
end -- Wow! So compact!