Had a bit of a hairy episode when I lost internet connection from home broadband, ISP went down completely

Decided finally to set up the Bluetooth dongle, recognised mobile OK, software is brilliant. I set it up for Dial Up networking and am amazed to see it worked first time. Logged in to cash game with broadband, started playing, pulled plug completely on Broadband, switched to Dialup via Bluetooth and mobile, connected in about 10 seconds. Woohoo!
I just checked the prices with operator and they are 0.5p/Kb.
Was wondering if I played 3 tables on an average site over 1 hour, how much that would come to roughly in KB?