Preview link expiry timeframe is too short

I was really surprised to just discover this as well. We often ask subject-matter experts to review our articles and 1 hour assumes they are free to do so in the next hour. A few business days would be much more appropriate.

For now, we are making PDFs of the previews, which are quite ugly of course.

I agree - it would be nice if the preview time was configurable. 

We like to share our documentation internally before it's published with the release. The 1 hour time frame certainly doesn't work for that.

I'm disappointed to learn this information. It makes it harder to review changes with my team. Also, why is it so hard to find this information in the docs?