Timed school bell hint and sounds?

I need 1 for my game. So what I mean is it's timed by EST and there's possibly a button you press but only I can press it (IF you can do this please do the button that starts it that only I can press!) This is the order: Advisory (11 min) Math (20 min) LA (20 min) Lunch (15 min) Science (20 min) History (20 min) Music (10 min) Art (10 min) Technology (10 mins) Gym (10 min) Dismissal (3 min) Thanks!

Well i know how to do the sound part! :P

while true do
wait(300)
script.Sound:Play()
wait(3)
script.Sound:stop()
end