[Perfectlap]

Guys with no history of taking down a transmission have done this job in their garages. So its not a technically difficult procedure, it's a one day job. You figure four hours to take down the trans an hour to do the extraction (a special tool is required that makes it simple) and putting it it all back together.
So ballpark 10 hours. Around these parts shops charge between $80-$100. You also have to add the cost of a fresh oil change because the system has to be cleaned out after this job.