There’s really no perfect standard for length in any format. I read on my phone so one page to you may be 5 pages to me.
I could see the word standard itself being the only reliable format. Like Standard Ebook uses as a measure for book length, but it may be hard to adopt generally.
“I read 567,000 words last month,” may come off oddly. But certainly not unreasonable.
“Let’s do a 200,000 word/month challenge!”
As for hardware quality, I’ve had my Tab S5E for years, and it is super solid. It looks, feels, and sounds great. It’s one of the few samsung devices that can be unlocked and Lineage installed on. So, if you’re willing to put in the time to install Lineage on it, it’s android 13 and the newest version of Lineage on it.