How to kill the player once the timer reaches a certain limit?

Hey there! I'm trying to figure out how to make the player have health on 0 (therefore, killing the player) once a timer reaches by, lets say, 10 minutes. I couldn't figure this out.

if mins >= 10 and seconds >= 0 then hum.Health = 0

This however doesn't work. Usually my time is around 0 to start. but the script sets the time to 10:00, Immediately killing the player once they spawn.

local mins = 9
local seconds = 40

repeat
	if seconds >= 10 then
		mins = mins + 1
		seconds = 0
	else
		seconds = seconds + 1
	end
	if seconds < 10 then
		script.Parent.Text = tostring(mins)..":0"..tostring(seconds)
	else
		script.Parent.Text = tostring(mins)..":"..tostring(seconds)
	end
	wait(1)
until mins >= 10 and seconds >= 0
if mins >= 10 and seconds >= 0 then
	local chr = game.Players.LocalPlayer.Character
	local hum = chr.Humanoid
	hum.Health = 0
end

"if mins is greater than or = 10 and if seconds is greater than or equal to 0" it's greater than. so it's killing the player. Script is just doing what you tell it to do.

Here's operators.

https://developer.roblox.com/en-us/articles/Operators

">= Greater than or equal to <= Less than or equal to"