Greencard application through L-1A visa

[diddl]

anyone here currently on L-1A status and want to/have already applied greencard? can you share your experience?

-- how long does it take (from filing to final approval) at VSC?
-- will this category be treated differently (in terms of processing time) in both 140/485 stage? if yes, how much longer/shorter?
-- anything should pay special attention?

Thanks a lot!!!