Level 74 and the contract is complete. Each character gained 16 levels during the six month sub. One of the characters went a little over 6 months worth of clicks, and one was a little under. Considering that I resubbed just to complete the contract, I think it's fair to call it even. (I intended to clear the clicks before the sub expired, but ended up with over 50k total left to spend. Watching ads for 50k clicks was too unbearable to even consider. I resubbed to keep my word with my anonymous benefactor, which, by the way, threw a monkey wrench in the entire "mercenaries for hire" plan.)
Character: Total Conquests, Conquests During Contract
Sally.: 66116, 28559
Zero.: 65732, 27580
Prof.Finkelstein: 66064, 27751
Total conquests during contract: 83890, or about 153 per character per day. A better average than I was expecting.