Oops! I tend to forget that I'm one of the few geeks that does in-depth stats that take weeks & weeks to compile
I'm going to bed now, but what kind of site are they going to advertise on (link list, tgp, blog, etc), what pages on the site (all, category specific, etc), what kind of ads (text, banners [sizes], flash, etc), duration of the ads (week, month, year)
Based on that & the numbers above, someone might be able to help you before I get back here tomorrow. If not, I'll give you my best guess
