That depends on how successful you want to be. Can you make SFI your sole income? Absolutely! It will take full time 40 hours a week to do so probably. What I did personally, and what I tell my affiliates is to start with 5-10 hours a week. See what kind of results you are getting. Then take it from there. you can increase or decrease your time according to you results and the results you are aiming for.