What's the life expectancy of the Nikon DF?

Basically what the shutter rating of it before it dies.

I don't know.

As with any camera, how the photographer uses it has much more to do with its longevity.

I have a nearly six and one half years old with about 87,000 shutter cycles on it. It is still purring a long.

If you are a disciplined shooter, there's no reason that the Df can't last over ten years. I have a Nikon F4 that has been around for over 26 years and is still working just fine.

If you are a machine gunner with your camera, then all bets are off, you might get a full 200,000 shutter cycles out of it.

You have a misconception about when a shutter dies.

Shutters on dSLR cameras are stress tested to a certain number and 100% of the shutters must pass. Your camera will never be used under those conditions. I recently sold an old Nikon D100 from 2002. I used it professionally and had over 80,000 shots on its shutter clock.

The new owner has had no problems with the shutter at all.

When shutters start to fail, the timing mechanism on it starts slowing down. Since new shutters are electro-mechanical, they are less prone to failure, sudden or not.

Since photographers who used 35 mm SLR cameras never worried about shutter cycles, when the moved into the digital realm, they did not worry about shutter cycles, only the beginners who are probably the worst of the "pixel peepers) they tried to avoid cameras with "only a stress tested shutter" that could clock 100,000, since the assumed they were inferior

In reality, the 300,000 shutter cycle numbers for the D4 are immaterial. Pros always carry a spare camera and if one stops working, then they get he other one out… No problem