The thing is that he is documenting all of the journey in videos, so you must add to that time, time for editing (which involves watching whole episode 1 or 2 times as he claims), rendering and uploading. Also he does bunch of other videos. So it is impossible to “walk 8 hours per day”. He would burn out very fast if he did that. He aims for 3 episodes a week. Also there are no horses in his version of the game (BETA 1.7.3) and he will not travel through the Nether because: it is too dangerous, he cannot set his bed in there (in case of death, which is yet to happen in the series!) and he cannot bring his companion wolf Wolfie to the Nether (mobs cant travel through portals in that version yet).
