However, it's unclear how well this approach works in the long run.

Diets are hard to stay with and usually don't work in the long run.

This will probably work out better in the long run.

Diets are hard to stay on and usually do not work in the long run.

I have no doubt that this works in the short run.

I don't think this works in the short run, though.

Maybe it will work out good in the long run.

Thing about secrecy - it never works in the long run.

But he knew that wouldn't work in the long run.

That has to be wrong, it cannot work in the long run.