Beneteau 473 cutlass bearing
It depends on the tools that they have available. If the yard has a hydraulic cutlass bearing puller, the removal and installation will take a couple hours max. If they don't, then 10 hours is reasonable. Most competent yards have a hydraulic puller.
I've done the job myself three times without a hydraulic puller and had to pull the shaft each time. I yearned for a professional puller but they're expensive for the DIY boat owner that will use it every 10 years or so.
Sabre 38 "Victoria"