TBF, it depends on the number of outages locally. In my area it is one outage every thunderstorm/snow storm, so unfortunately the up time of my laptop, even with the help of a large, portable battery charging station (which can charge multiple laptops at the same time), is not optimistic.
I sometimes fancy that I could just take cash, go into the wood, build a small solar array, collect & cleanse river water, and buy a starlink console.
Costco had a deal on solid-state UPS & solar panels a while back that I was happy to partake of
Yeah, I'd guess I average a power drop once a month or so at home. Never calculated the nines of uptime average, but it's not that infrequent.
I know when I need to reset the clock on my microwave oven.
99.9 is like 9 hours of downtime a year.
Far more achievable pricing and logistics than even ten years ago.