1. How long (In terms of months/years) did it take you to go from 0 hours to finishing your commercial and/or CFI?
6.5 months from Zero to CFI/MEI/CFII

2. Were you working full time and flight training on the side?
Full-time training, no job

3. How many times per week did you fly typically?
PPL: 5 times a week
IR: 3 times a week
CPL through CFI/MEI/CFII: 1-2 a week

4. How many hours of ground school per week typically?
2ish hours a week or less, mostly self study via FAA books & YouTube

5. How often were you doing homework during the week?
If you count studying as homewook, all the time

6. What were your biggest challenges/hurdles?
There were plenty of plateaus along the way, the biggest challenge/hurdle was keeping motivated to learn the information

7. Any recommendations/advice for those training while working full-time?
I always told my students you can have your training fast, good, or cheap... but only 2 of the three. Work hard in your off time and be extra prepared for every lesson.

I went to a pilot mill for my training and taught there after. 6.5 months for all my ratings, ~2 years from Zero to airlines