How long did it take to get that movement in the glove?

How often do you plan on checking it in the future?

Many techs are looking for what is likely to happen before your next service.

I do not know how the techs check this - maybe they can connect a gauge somewhere.

Why don't you ask the tech to let you now why he said that you need service on this matter.

I talked to my family Subaru tech, and on their cars they change PCV valves on a regular basis as maintenance.

The crankcase breathing system deals with crummy oil - it shall clog up at some time.