Re and Re Rear Main Seal

Question for the group
How long should it take to re and re the rear main seal in a 1990 560 SEC ?
I guess more specifially how many hours should a reputable shop charge for
this service?
As an aside, since the engine and probably transmission are already going to be pulled to replace this $5 part are there any other service items that should be addressed at this time?
Your responses will be greatly appreciated.
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