Posted by QuBic in The guys at VideoGamer.com had Rockstar speak with them with when VG went to visit Rockstar’s London HQ, where they got to ask a spokesperson various questions about GTA 4.
The spokesperson told them this:
"If you’re not in a rush and you answer the phone when it rings it’ll take about 100 hours to complete", we were told. "It’s harder to distinguish between main and side missions - there are loads of both. But there are more main missions than side missions. It’s not as clear cut as it used to be because of the phone."
So what are you waiting for? Go finish the game! 
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