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Hi my name is Robert.....
It would take about 4 to 6 hours of labor, if you already had an AC unit in place then it would only take about 2 hours but most shops will charge 1/2 hour to remove the old unit. SO close to 3 hours.
So if the wiring had to be done on a new unit I would say a good shop can do this in 4-6 hours, there are guidelines the shops should follow as well for repairs and installs... Hope this helps some, IF you have more questions or concerns please feel free to contact me... Robert
If you have more questions on this please let me know.... Robert
Was just checking in to see if my answer helped, IF you have more questions or concerns please feel free to contact me.
Have a safe and Happy Holidays.... Robert