This was useful on a trip to Turkey I took in the spring, too bad
Users using it to tether PCs I'm sure was a big red flag...
http://www.justsearchseo.co.uk/tools/page-size/ Use that to calculate a page size.
This page as it stands could be downloaded 517 times over the 50MB limit. That isn't too bad if you really limit your use to absolutely necessary situations.