Doing it with Bristol -> Basically invested about 4 hours a day into the learning process. Took me about 1 month per module, give or take a week for waiting on a revision class, another month hitting the AviationExam question bank (definitely get another question bank and dont rely on just BGS). So about 2.5 months per module altogether. Nearing the end of Module 3 now and i feel exhausted - dread looking at another lesson, You *could* do it faster if you feel like it, i suppose. But i'm happy with Bristol - good support, good platform - teachers are good in the online revision course. 100% online & 100% english were the selling points for me. I didn't buy any additional books or materials that were offered - only their online platform. Didn't feel like i needed it (i have previous experience as an instructor in the US) - your mileage may vary.