[hamburglar]

Just checked and you still have this completely broken paragraph:

"Given user_base = 8,000,000, and a numbers crunchable per minute (ncpm) of approximately 6666, we can assume that it would take approximately 20 hours for one $10 virtual server to eat through and find every user's phone number (hours = user_base / (ncpm*60)). At our worst case of ncpm = 5000, it would take approximately 26.6 hours."

Look at it this way: If they only had 5000 users, would you estimate the time to find all their phone numbers at 1 minute? No.