How often do/should you check your SPARE tire pressure?

[GoFrogs]

For those of us who are lucky enough to get a spare tire (donut or full-size), how often do you take the time to check the spare's air pressure?

Today, while rotating my [base] WRX's tires, I checked my spare's pressure before putting it on as a place holder and it was at 20.9 psi (140 kpa ).

I think it has been several years since I last checked (last time I self-rotated).

Car is a 2019 w/69833 mi and on its 3rd set of tires (Dunlop Sport Maxx :\ --> Conti DWS06 --> Mich PS AS4 .

I don't normally keep an inflator in the car, so it would have been poopy big time to discover my spare's pressure air a 1/3 of what it should needs to be.

Do you run a flexible stem extender from the spare for easier checking, or do you just remove the 3 layers of stuff to get to the tire and check?

I think I'll go to Harbor Freight or Tractor Supply Co. and see if they have flexible stem extenders. Worst case is I'll go to an auto parts store (more expensive) and see what they have.

Thoughts, suggestions, other?