2009-06-27 Sat Midnight - Overnight to Brighton

It's not far off 10,000 revs per mile (depending on gearing etc), I think.

or aka a fuckload.

According to wikipedia, multiplying gear inches by 0.0798 gives you metres per crank revolution. In my case that's 5.59m.

72 miles is ~115km, so about 20,500 total.