Gasket Bmw

How many hours to R&R a oil pan gasket on a 1989 325i Bmw?

also hours to R&R cylinder head, valve job,camshaft & timing belt. Please?
and R&R driveshaft?

Oil pan gasket, I can do it within 2 hours. pretty straight forward for this car. (M30 engines requires engine lifting, this engine does not)

Cylinder head for [...]