956,000 calories if by hand
I think you're a little high on that bid there Kirk... OP has about 25 yards of dirt to move and due to the lack of details I'll assume we're just moving it aside to get it out of the way.
Since we have no idea of soil type, I'll go easy with a clean sandy soil which with the perfect moister content you'll only burn about 300 calories an hour.
In those perfect conditions if a healthy guy can't move 10 yards in a 8 hr day then he's fired!
Based on that, then 20 hrs should do it for a total of about 6000 calories.
Of coarse if the soil is sticky, rock, root infested clay then the bid could be quadruple that.
Either way I think I won the bid.