I'm thinking of sign up for adbrite, so how long would it take for someone to purchase ad space on a site with 500 unique visitors a day, and is p2p related site? Does it usually take a couples days?
it depends.. no really. If your site looks attractive someone might buy a link but then again with 500 uniques a day I don't know.
It can take forever...depends how attractive your site is to an advertiser, what its geoip profile is...