How many shaves are people getting out of a Nacet?

I have a coarse beard and sensitive skin. I rarely get more than 3-4 shaves out of any blade. Nacets are similar to most other blades in that regard. For me, the worst blade for longevity is the Feather. I can get only 2 good shaves. Partway through the 3rd shave, it starts to feel harsh and I have to change it out mid-shave.

Agreed. Feather typically good for one brutal first shave and an irritatingly harsh second shave.

Went back to Timor for a 6th shave on a particular blade and it was dead balls on perfect - smooth and efficient. When it comes to Wolfman WR1 and BBS1, so far nothing is as good a pairing as Timor corked although Nacet by far best of the rest

I imagine the second and third shaves are just as harsh on the blade because you change the angle of the razors. You still get the same singing sound from the vibrations of the blade in the razor. The blade still meets the same amount of hair albeit the hair is shorter. The length of the hair is unimportant.
If you were doing 3 passes with the grain, then the blade wouldn’t be meeting much hair because it already cut it on the first pass WTG, so it would be safe to assume it will last much longer.
I have to apologise because I have no empirical data to support such claims, but it seems logical...

Agreed completely

I get 5 -  7 good 3 pass shaves then see the Nacet deteriorate. I'll get 2 - 3 more good shaves from it before I change the blade. This post makes me wonder why I settle for those last 2-3 shaves from a less-than-prime blade, considering how cheap they are & also considering how demanding we are of our equipment.

Perfect timing for this thread! Just this morning I was using my RS10 with a nacet blade for it's 4th 2 pass shave.
It felt like a rake going across my face. I changed it immediately but a blade only lasting four shaves is much too little. This is why I'll stick to my polsilvers!

Nacet -----> 2 Three Pass Shaves (with buffing and clean up)

I get 3-4 shaves. I think they are great blades.

Usually 4-6 days of daily 3 pass shaves.

I used to get only 1-2 shaves before I would feel Nacet get uncomfortable. I don't use them any more for this reason.
Gillette Platinum and Polsilver give me 3-4 comfortable, high quality shaves.