In reply to Tomtom:
I think that it would be way harder than 8a by definition. I occasionally climb that grade, of course there is usually one single section that is hard (for me) and lots of easier terrain before or after, especially on rock. Indoor one might create an 8a stamina fest with continuous moves of the same difficulty, but then the individual moves would be well below my personal limit. I would also tend to say that a route with very continuous V6/7 without any rests (!!!) would be hiking terrain for the very best. But really?