So I recently bought me a laser level and marked me out a swale in the front yard area of my house.  I dug out the lentgh with shovel then started to working on digging out the swale and took me nearly two hours just to get a little over 2 foot of the sale and about 1.5 foot deep.  So this is going to take me a few weeks to finish up on my days off.  Just to many rocks in the hole.