Not at Mac at the minute.
Checked last 10 days screen time, seems to be about 7 hours between charges (if charged every 2 days).
Edit: monitored recent usage, pretty much 9 hours from a full charge (currently at 17%).
That sounds a LOT higher than I’d expect, and a lot higher than pretty much every reported usage I’ve seen for the first-gen iPad Pros (both the 9.7-inch and the 12.9-inch) on iPadOS 16.
It’s not that I don’t believe you, but I’ve seen that data read incorrectly thousands of times; are you counting since you unplugged the iPad? If you’re counting from last 10 days, you might be including screen-on time from the previous cycle. Like I said, I’m sorry to be skeptical, but I’ve seen thousands of screenshots incorrectly reported, and it really sounds too high.
I’m barely scraping 10-11 hours of similar use (web browsing and media consumption), on my 9.7-inch iPad Pro on iOS 12, with low brightness. That use is light, and I’ve never been able to get any more... on iOS 12. 9 hours would be at most two hours below what I’m getting, and according to everything I’ve read, it’s too much. I’ve optimized every single setting, and I know how to do it: I’m getting 16 hours of screen-on time on my iPhone Xʀ. I’ve only seen one other person, ever, get 16 hours on a Xʀ. The vast majority were at 10-11, at best (on iOS 12, like me). On iOS 16? They’re barely scraping 6.
I’d expect 6-7 with light use maybe, at best? I’ve seen some screenshots and they were all on about 4, but with lighter usage, 6 or 7 may be possible.
I’m not discounting the possibility of me being completely and entirely wrong (I’d never do that): if I am, that’s great news for all first-gen iPad Pro owners, at least battery life isn’t as obliterated as it could be; in fact, I hope I’m wrong.