The problem is, you are never sure how long repairs done down in holes will take, till it's done. Things go wrong.
Undoubtedly, the contractors are hoping to get it all done in 3 hours (plus an hour of travel and tool collection), but want to make sure that if it takes 8 hours, they don't take a bath. (They are pretty sure that, if you accept the $1200 quote, and it takes 8 hours, because of some issue not yet visible, that you won't be all eager to up the payment.)
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