I need Help, To make the Gui appear to all Players at the same time?

I keep having this problem, I think I'm using the for i, v in pairs() loop wrong for some reason. But every time the second Player has to wait to for the first player to close his Gui so it could appear for the second player. the script so far.

function SelectMap()
	if RoundStart.Value == false then 
		for i,v in pairs(game.Players:GetChildren()) do
			v.PlayerGui.GameGui.MapVote.Visible = true
			for i = 15,0,-1 do 
				Status.Value = i
				wait(1)
			end
			v.PlayerGui.GameGui.MapVote.Visible = false
			MapSelected = true
		end
	end
end

local function SelectMap()
	if RoundStart.Value == false then
		for i, v in pairs(game.Players:GetChildren()) do
			spawn(function()
				v.PlayerGui.GameGui.MapVote.Visible = true
				for j = 15, 0, -1 do
					Status.Value = j
					wait(1)
				end
				v.PlayerGui.GameGui.MapVote.Visible = false
				MapSelected = true --erm.... so this gets set a lot of times?!?!?!?!?!?!
			end)
		end
	end
end

can't be bothered to explain because this isn't even FilteringEnabled