i took the mastersound from studio, but it's not matching with the origin movie ONLY on fcp.(not on After Effect. sound and movie fits alright when rendered in AE)
org movie's running time is 52:14:05 and
mastersound's running time is 52:11:02.
I think it's almost sure that it's a problem about DF and NDF, but even after changing DF/NDF settings on sequence setting and preference, no change on mastersound's running time.