FWIW:
The local details shops charge between $225-250 for a thorough exterior, interior and engine bay detailing. The exterior gets a wash & wax, wheel cleaning, tar removal, tire detail, etc. The interior gets vacuuming, cloth/leather upholstery cleaning & dressing, leather seat and dash/door trim cleaning/dressing, carpet clean & stain removal, class & instrument cleaning. The engine bay gets a “steam” cleaning and a “wipe down” with something probably equivalent to Son-of-a-Gun or Armor All.
I don't know how long it takes them to do the job.