I have been BSL since about 2005-present. I admit my heart wasn't in it anymore circa 2006, but now I'm rejuvenated...lol.
I always take good care of my hair, and just thought it was terminal length, but I found a long hair board for yt people this year, and found a thread where they said your hair will start to form a V shape you cant get rid of once it hits terminal. My hair doesn't have a sharp V yet, so I figured I'm just lazy and need to step my game up.
I been weaving it up off and on since June this year, and I'm due to take this sew in down in two weeks so I'm hoping I'm at least halfway to MBL! **crosses fingers**
I also realized since having this "invisible part" in that my hair only grows 1/4in give or take a month :-( In the past few yrs I've been chopping off 1/2in every few months for trims. My hair doesnt grow fast enough to trim that frequently so I'm sure that played a huge part in why it hasnt really budged.
But to answer the question, MBL from BSL has been a BEAST!!
ETA: It seems I went from SL to APL in no time, but I was leaving my hair alone and wasnt paying attention. I think the golden rule to get over a hump at any stage is to just leave your hair ALONE.