My schedule is:-
6.50am wake up
7.00am start work
12.00pm lunch
1.00pm start work
5.00pm dinner
6.00pm start work
9.45pm get ready for bed
10.00pm sleep
I don't have any distractions (except the occasional quick read of HN, when I need a short mental break), don't own a tv, no kids, wear the same clothes, I eat the same meals daily and I wear headphones and listen to music.
I'll do this for 90 days and then relax on the schedule somewhat and then repeat for another 90 days.
Let me tell you. It's actually quite interesting on what you can accomplish with 13 hours of work (91 hours a week) available to you.
Elon has it right. In a compound interest sort of way, what you can achieve in 90 days (with this schedule) is akin to someone else taking 6 months or more to do the same.
Of course it means no social life. But that's for later on.