Mehanic timer problem..

so i noticed my timer is delaying (if thats a word sry bad english ;S) few days ago it turn the lights off in 20:00and today it turned in 20:01 almost 20:02 it was like 10 second from 20:02 anyway...will this fuck up my grow? do you know any better quallity timers or all of them are same shit different package? peace!
oh yea i got this kind of timer http://www.intertrg.com/alati-i-uredaji/timer-tajmer/timer-mehanicki-24-sata (costs like 32 KN = 6-7 dollars)
and i was planning to buy this one it seems better
http://www.hempatia.si/timer-omnirex.18a any thoughts ?

A couple of minutes a day will do NO harm to your grow!
When the timer gets to be to far from the real time as to upset YOUR available time. Simply turn to the correct time.

Wow, I thought this was going to be about a timer not turning off or not turning on. A couple of minutes isn't going to make a difference in the world. I have 3 that are unusable, not sure why I don't pitch them. I keep thinking I will try them again and they fail. I have one that turns off after 10 minutes.

I switched to this timer. It's a little more expensive, but has been dead accurate, and has 2 sockets. You can even get fancy and program different times for different days.

oh..,okay,just asking because i like everything to be good and accurate,if its not i freak out because it will fuck up my grow,i never had timers before so i just..dont know..anyway thank you!