I need some help with this function/loop?(unanswered)

So I know I've asked a ton of questions on this but even though I have been tinkering around a lot with this script I need someone who knows what they're doing better than I do. Using this script I would like it to display a message when either the time runs out or they're are no "infected" players.

function survivor_finish(text,time)
	time_left = 20--just to test with
		while time_left >= 0 do
			time_left=time_left-1
			wait(1)
			print(time_left)
	if #getTeam(Game.Teams.Infected) == 0 or time_left==0 then
		m=Instance.new("Message",Workspace)
    			m.Text = text
    			wait(time)
    			m:Destroy()
	end
	end
	end

survivor_finish("Time has run out, survivors win!",3)

Thanks!

this may work, it is better to use a for loop as it takes care of the need to minus one each time and just use time_left as usual

function survivor_finish(text,time) 
	for time_left=20,0,-1 do
		print(time_left)
			if #getTeam(Game.Teams.Infected) == 0 or time_left==0 then 
					m=Instance.new("Message",Workspace)
					m.Text = text
					wait(time)
					m:Destroy()
				end
			wait(1)
	end
end
survivor_finish("Time has run out, survivors win!",3)