Customer needs a 40' x 30' area prepared for a tot-lot. Wants the area to be excavated to a depth of 6 inches. Most of the sod and dirt is going to be used in another area of the yard, approximately 25' away... so there will be very little if any disposal. Will have a sod cutter & bobcat to work with. How many man hours do you think this should take? Thanks in advance!