http://www.project1999.com/forums/announcement.php?f=33
Has a bunch of questions you can view. I don't see anything that has time requirements, but last time I was going to sign up for being a volunteer guide, they told me during the interview that they needed me on from X to X time.
I am guessing P99 has very relaxed rules. You can always sign up and see if you are chosen for an interview and find out that way.
More than anything I am just passing time at work on these forums, so asking publicly is the route I took.
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