Nbde part 1 .Takes only 3 months for a 90 score

3 months are more than enough for nbde prep
Month 1
start with all the videos and lecture notes,5 days for each subject + 5 days to revise.you are done with full absics in 60 days max
study for 8-10 hrs a day [4+3+3] typical day
spend 3 hrs revising each day,no matter what u are studying
Its not how much you study but how much you can remember,repeated revisions are essential.
Month 3
Strt with the q banks 1976-2006]asda,revise with decks
if you have done your videos and lecture notes well,you should be able to do decks in 3 hours flat for each topic.Dont gobble up decks
Last one week go flat out and revise as much as u can
Good luck