Shop order start and finish dates

Yes, with infitie scheduling only the manufacturing time is considered. Which is a bit confusing as for the lead time calculation you can select Labor, Machine or whatever is longest. 

I always explain it as the Work Center is, in this case, representing an ‘assembly area’ rather than a machine.

This could also give some useful data as if you did have a restiction in the total amount of manual assembly you can do at once e.g. this particular part would use up a large area of floorspace to assemble, you could use the machine Resource Share to represent how much of your assembly area will be used up by each shop order.