The average outage time per year in Germany, as far as I remember, is below 2min. The uptime of my non-USV-backed server at home supports that, but that’s only anecdotal data.
The only power cut I've experienced since I've been in the UK (8 years) was about 30 seconds long. By the time the operator had sent me an SMS about it, it was already back up. This is despite the UK's rapid transition to renewables. There was a fairly major power cut by our standards in 2019, but it didn't affect me.
Personally speaking, power cuts are so rare and short that I don't think about them or plan for them.
According to tennet.eu (the grid operator for the Netherlands and parts of Germany), the uptime for their high voltage grid is about 99.99963%. Obviously it will be lower for individual consumers, since there is a lower voltage grid in between them and the high voltage grid that might fail separately. Still, I think I've personally experienced only one power failure in the last 5 years or so.
