Well, say one of your page is 120KB in total with images and everything. 10GB would be enough for:
10 gigabytes = 10 485 760 kilobytes.
10 485 760 / 120 = 87 381.3333 pageviews. Keep in mind that is only true if no one has caching enabled (which most people do).
Anyway, as for June 1, all...