I earn about 7$ a month from faucets. I work about 4 hours a day on it besides some other works on computer, so if you work only faucet maybe you can earn some more. So, if we count regular 8 hours work and say that is about 15$ per month or $180 per year, that would be around 6-7 years to earn 1BTC... maybe less if you get some referrals.

I just check my stats... I have earn 0.006 BTC from faucets in February