Turn-a-round is often same day for “tune-up.” Includes cleaning, oil and greasing and replacing the common parts, which I stock for most clippers.
I service Andis, Oster, Laube, Wahl, Lister. Note that not all models of clippers have parts available. Some brands are made in China and parts are often not available. New models usually don't have parts released by manufacture until they become out of warranty or make it in the market place. Since Covid some parts still have not become available to the wholesalers.
Clippers should be completely serviced every 6-12 months if used heavily. Or when problems develop. You should do cleaning of accumulated hair daily.
Clippers under warranty should be returned to the manufacturer's service centers in most cases.
Is it worth repairing my clipper? The answer is usually yes! The cost of new clippers has increase a lot after being stable pre Covid. Unless you like shiny new looking clippers almost any clipper can be made to work for many years. I still get old Oster A2 clippers which have not been made since the 80's!