Help with timing

[Extinction]

Hi there,
I have a little script that checks for how long you have been pressing KEY_FIRE. But the problem is, it is couting very slow, example: if I push the KEY_FIRE for 4 seconds it says online 0:02.033. Is there anyone that can help me with fixing this? Here is the code:
http://pastebin.com/f15cd658

Thanks,
Marcel

[Turkey]

Lag maybe?