Yeah I got that; How fast can a laptop charge though? I mean as you said, depends on the battery too. However, a standard 5 hour backup battery? Is there tech that can charge it up in 30 or so minutes?
I'm not sure there is a standard measure of that, even in reviews.
There's so many factors you're going to want to go to someone who owns the device, especially since there is no standard "5 hour battery" size.
ex. My ThinkPad Yoga had a 40-50-ish watt-hour battery and gets 4-5 hours of battery life. It has more efficient stuff under-the-hood and a smaller display too.
My current T430 has just over 60 watt-hours and gets 2.5-3.5 hours.
I used a 60 watt charger with the Yoga, a 90 watt charger with the T430, both charge rather quickly to me but definitely not 100% in 30 minutes.
If you need a fast turnaround time, I would consider a laptop with a hot-swappable battery so you can switch in spare batteries as you need.