When is a blade done?

If I would throw away blades after the first shave, I would miss the best shaves with most blades(shave 2 and 3).
I know it is time to throw away a blade when I feel stubble on the right side of my face in the goatee area even after multiple passes.

I got tired of finding out. 2 shaves and done. Pretty much with ANY brand.

I think a blade is done when it stops cutting the hairs cleanly without tugging.

For me, when it begins to tug.

I think a blade is done when it stops cutting the hairs cleanly without tugging.

For me, when it begins to tug.

The same for me, pretty much. But I discard all my high-quality vintage blades after 12 uses, so tugging virtually never becomes a problem.

I've done a good deal of testing with my go to blades. For Astra I can probably stretch 3 shaves but towards the end of the third shave its beginning to pull. For Gillette Silver Blues, the fourth shave is not very good. Rather than endure that, I just throw out my Astra after two shaves and throw out my Gillette Silver Blue after three shaves.

I toss a blade when I notice more weepers than normal, or after 3 shaves on the blade. Blades are cheap, so why not use a fresh one when I have the option. No point in stretching out the life of a cheap blade.

Usually 5 shaves for a DE, or sooner if feeling a lot of tugging or weepers.

For GEM SE blades, I've noticed that on the 3rd shave, my results are nowhere near BBS, so from now on, maybe only 2 shaves and out.

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Lately, I’ve been somewhat focused on Feather New Hi-Stainless blades.

I’ve been taking them up to about 10 shaves. (My shaves are almost always two-pass shaves.) I’ve noticed that for me, the best shaves on these blades tend to be between the 4th and 8th shaves, so I’m glad that I haven’t tossed them after the first couple of shaves (which haven’t been bad shaves by any means, either).

No one has mentioned blade coatings yet. I recently read a prominent reviewer talking about coatings wearing off at around 4 shaves and the blade getting rough. I don't know if there's anything to that or not.