Comment 5 for bug 533416

"In addition, Apt-p2p should have a "fallback after timeout option" where it falls back to the ubuntu repository after waiting for a set amount of time (timeout). This ensures that the packages/repository that the user was trying to download will be downloaded, and will be added to the apt-p2p pool. The next user will then have more chance of downloading the package/repository from apt-p2p. This also prevents users from getting hung on certain repositories where there are not many peers."

It is my understanding that it already does this, however I think I found a bug with the system.
https://bugs.launchpad.net/ubuntu/+source/apt-p2p/+bug/578462