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I think if there are any signs of physical contact (e.g. from adjusting the burrs too close to each other) then they will need replacing. That will have damaged or destroyed critical points on the burrs.
Else, I think you need to take the burrs out and have a close look at them. If they look like a drill bit that has done some duty; like if the hard surfaces look like polished bright metal instead of sharp, ground edges; if the sharp sides of the burrs look worn, chipped or rounded; that sort of stuff.
I have to say, unless they’re pretty worn I don’t think you’ll notice. It takes a time to bed new burrs in, but once they’re grinding satisfactorily they don’t wear down all that quickly. Beans aren’t that hard or abrasive. Some higher-end manufacturers state to replace after 250kg beans. Others it’s different weights. But then on the flip side of that advice I mashed my burrs right up following stupid advice about resetting the zero point in my grinder and after a while they’ve actually bedded back in and work fine. So I’d say it’s not critical and unless they look physically deteriorated in a bad way, it’s probably not going to make much of a difference.
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Jonny69
How do you know if your burrs need replacing? Are there any tell take signs?
The guy I bought my grinder from said they would be worth replacing.