I can understand the struggle! I've gotten to 127 4 times only to find out I made a mistake somewhere... it's really difficult to stay focused. For me, I found listening to music was the best I could have to accompany the process - whenever I tried watching something at the same time, I ended up messing up somewhere between 60 and 100. 10 egg intervals make sense... you need to bite the bullet and make sure to concentrate on what you're doing the entire time. Also, you need to not feel sleepy...! I would agree with 3 1/2-4 hours, that's pretty much what it took me. I ended up taking a break every 25, the hardest was to not start being overconfident after reaching 70+ and letting my guard down for just a minute haha. It's a real pain, but worth the investment once you get it (and it's only a matter of time since there is no luck involved, as long as you do it right it's ensured to work!).