No issues, maybe they might not even fine you..and like max said, some of my friends have overstayed for upto 3 months, and our company just paid the fine...

There are some companies(who do not have enough visas), who bring in workers from outisde on a business visa, let them work for an year or so, and then simply pay the fine when it is time for them to exit..for these companies, a fine of maybe 20,000 QR is nothing when compared to the revenue these employees bring in...