The hours you need to spend on SFI depends on the amount you want to earn.
If you just spend time to complete your to do list,then 15 minutes is sufficient.
You place a standing order for 1500 VersaPoints
You become a member of S Builder for taking care of your downline .
You can also join some coop for more PSAs.
But if you you want everything to be done by yourself,then atleast two hours every day is required