One of my mowing customers wants me to quote him a price to remove three(3) 6' arborvitae and replace them with 3 new 3/4' or 4/5' arborvitae. The old material will be disposed of on-site. I'm trying to figure out how many hours to quote. I've never removed one by hand before. What kind of root structure do they have? How many hours would you figure? Usually I mark the plants up around 40-50%. Is this enough to cover me for possible plant loss? Is there a big difference between the Dark American and Emerald Green varieties? Thanks!