View with how long node is down

Hello All, I remember that some time ago I had found out a post where there was script to change custom view and we could see for how long node is down. It is good to have this information when we need to complain with local providers, etc.

I have looked for that but unfortunately I didn´t find out it.

So How can I create view or to include on the Down Nodes view how long node is down?

Thank you.