They don't get a 100% keeper ratio any more than digital shooters do so it's unlikely they will upload an entire roll at once.
I don't think I said anything about uploading a whole roll, but it did seem that it was the film people uploading in bulk, because they are not in a position to just do one a day and process the same day, nor does it make any sense to shoot a whole roll in a day just to get the one for the upload, which is why I made the suggestion.
I like Luke's notion of letting them get a head start, then they can scan what they like of their shots, and do daily uploads as they will have done the necessary work ahead of time, and will stay ahead for most of the challenge. a couple of photos a day if people get behind is fine, really, but when its 7 or 8 at once, I just happen to think thats over the top. It doesnt matter a bit when its a thread about a particular topic, we like seeing all those film shots, but when everyone is uploading daily to the same thread, its potentially a royal PITA for those watching and commenting.
BTW speaking of threads.. will there be a single thread for each day? Ie... 30 threads, each titled for the day it represents? That would immediately solve my prob with film, so I am suggesting it as a way of managing. The film shooters wouldnt need a head start, and they could shoot daily just like everyone else, and do their uploads as they process and scan. So I guess there would need to be a sub-forum created for the challenge itself. One thread for the rules/explanation of the challenge, and then threads created each new day. Those of us in the antipodes might be the thread starters, or perhaps Luke/whoever could create all 30 threads at once, at the beginning. Just an idea.
I think then, I would create a new set at flickr, for the "whatever its going to be called" challenge., and reference the shots there. That way too, using the forum instead of the gallery, means one would not be running out of gallery space too quickly.