Shop hours for certain work

Can you give me an idea how many hours is involved to do the following:

Change timing belt, water pump, tensioners.
Replace head gaskets with bolts, cam seals, front main seal
Replace valve cover gaskets, tube seals, spark plugs.
Replace radiator hoses, serpentine belt.

I believe most of this work other than the timing belt stuff is pretty much along the removal path for the timing belt and water pump.

Thanks again for all your help with my other questions. You are amazing.

Jon