If u are that type who is capable of going every lesson it got, here are the list.
BBDC== 2+-3months
Comfort==3-4months or even 5
SSDC==2-3months
all time taken is average.
Comfort RTT is damn fast but pratical booking sux, the other two is u have to wait awhile for RTT but pratical lesson is quite ok. Any question please post again

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®To The Maximum Limit Of My Life®