Haven't really thought it out -- probably 15 minutes. In past years, most of us missed a few picks here and there but you can make them up anytime when you sign on so it usually works out.
Unfortunately using the utility there is no easy way to proxy. You could have someone log in as you to make a pick but that's the only way that I know of.
To be honest, I'm at a huge disadvatage as I live in Israel so the times are set for convenience in the States but I know that up front and still have had a great time with this league the past 4 years, so hopefully you'll join us!