I can't remember where I read it, but the requirements seemed more extensive than that. That is to say, I don't think 50 miles is going to do it. The idea here is that if you disconnect the battery and therefore zero the parameters, if they allowed you to try an emissions test right away, you could hide issue with the emissions system.

I simply cannot remember the requirements - but I think that miles is not the issue - it's the variety of driving and temperature cycles that does it, as the requirements to get the system to interrogate or 'use' all of the monitors go beyond simply driving the car, say, at 60mph for 50 miles or so.