I think the YotaTech guy is pulling your leg. I've done 1 2nd gen, 3 3rd gens and 2 4th gens (TB, water pump, tensioner). The 2nd gen was the fastest (about 5 hours and my first one) and the 3rd gens took me about 6 hours (the 4th gens took closer to 9). I think an experienced dealer tech...