I'd say you should hear something within a week. If you submitted on the weekend it could be longer because I'm sure they have quite a few sites to look at when they get back Monday. Good luck. I'd be happy to look at your URL for suggestions if you like - I run Adsense and YPN.
LOL, I had a few sites running YPN, reviewed by them, and making nice rev...My partner on that venture and I terminated that business and you cannot EVER change payment info. So I applied to YPN and they rejected the very sites they had already accepted and paid for months...Man, maybe they use the same interns that handle their hard coded serps to review sites? :)
The app took 2.5 weeks to process and I got some form template saying they might go out of beta at some point, yada yada...They are simply GIVING Google millions a month these days due to unbelievable incompetence.