New to Lua and wondering what I'm doing wrong

[scoteecopter]

So I recently decided I wanted to learn Lua and be able to make addons. So I figured I would start out small to test what I have learned so far. Yet for some reason I can't figure out, it isn't working as intended.

What I have so far is:

local time = GetPVPTimer()

while time == 270000 do 
   print ("4:30 remaining!")
   end
end

What I'm trying to do is just announce in the chat box the time remaining on a PVP timer at certain intervals. However it seems to only run the script when I load into the game, instead of constantly checking to see when time hits 270000.