Probably OK.

MB has huge gears on their parking pawl. Which makes engagement require a significant degree of rotation. It makes park roll a piece. I doubt anything can be wrong if it does engage.

Reverse does take a while longer than many trannies, but gets worse when failing so it could indicate a problem. Don't worry about it unless it changes.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician