[jimnotgym]

I think that depends on what you mean by 'supposed to'. I don't recall this being suggested for normal applications, and if you have a very tight specification then a colorimeter may not be the correct instrument in the first place. As I said above, I'm not a colour scientist, but I do know something about what was done in practice in certain industries.

[deadvoid]

i'm in post-production so lots of color spaces & monitorings. colorimeters drifted with age/usage, so annual check for the first two years or so is good enough but then gradually afterwards it's good practice to calibrate more frequent, and more likely there's a small fee for that. spectrometers (or spectroradiometer can't be sure) are still insanely expensive.