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The answer varies by person, and by blade.

I get about 3 shaves from an Astra, and 5 from a Feather. The degradation is very gradual, but eventually I say:

. . . "Hey -- If I don't apply...

FWIW --

I don't think that people's skin "adjusts" to being shaved. I think their technique improves, until they're not scraping it away.

I could be wrong . . .

. Charles

PS --...

One more suggestion:

. . . Stop doing multiple passes.

Do _one_ pass, WTG, with good lather, until you've learned how to do it under control:

. . . no weepers, no razor burn.

When you can...