I went from zero hours to 1475 in 26 months and was at Skywest in ATP/CTP. I did Part 61 full time. I had a great instructor and a full understanding with the owner. I paid in two $20k installments which got me a 10% cash discount. I spent $40k on $44k in training and got everything through CFII. I did my written in this order, PVT/COMM/CFI/INST/CFII/FOI. Did my Comm and CFI then my INST and CFII back to back on the same days. I used MZeroA for ground and saved a ton of money getting written sign offs. I was at the school everyday studying, discussing, flying, helping on 100hrs, etc. Private in 30 days, Comm ASEL 5 months, CFII by month 6, and my CFI by month 9 (could have been faster but I was burned out after CFII). Then taught at Aeroguard. I would never recommend anyone getting their ratings there, long story. The key to my success was finding a school I could negotiate a fair deal, well maintained aircraft, and a good instructor. If I lost any one of those I would have been screwed, like the guy who came in as I was leaving hoping to do the same. All the instructors left so he struggled to complete his instrument and now is back in IT. I still teach on the side. I get numerous clients asking for me to do for them what was done for me. None have followed through. You have to have drive and a little bit of panic to get through fast.