One of my techs did valve guide seals and resealed the upper timing cover yesterday. Based on all the other work he did, I would say it took him about 3-4 hours. We probably billed 5 (I didn't see the ticket). The book time for the seals alone is about 3 hours.
To do it in these times you will need a way of putting compressed air through the spark plug hole (to hold the valves up) and a way of depressing the valve springs. Otherwise its all just common hand tools. I don't know if they have pictures but the valve depressing tools can be purchased here: http://www.baumtools.com/