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It is 21.6 Wh capacity and charges at up to 45W, so it should take less than half an hour to fully charge from zero. Not sure where you got the 3-5 hours from?

Valves own testing + reviewers. Nobody anywhere has got anything close to the speed you're suggesting.

On the GamersNexus review Valve says charging should take 90 minutes. But it took GamersNexus and other reviewers 3 hours. So it probably broke in a software update and a fix is likely coming. But if this is important to you, make sure to wait for the update to land before making a decision...

For the Quest 3 for example, you can get a Bobovr halo strap that has replaceable magnetically connected battery packs. If you have at least two, you can just swap them when one runs out and by the time the second one is empty, the first one is charged.

IIRC Valve is going to release something similar in a couple months & I am sure there will be other accessory developers chiming in as well. :)

Gamers Nexus lists a ~120-min battery life in their video review of the Steam Frame.

Reviews say around 2-4 hours when streaming from PC, 1 hour is if you're gaming directly on the device with the graphics turned all the way up.