That’s varied. A bit. More than a bit.
One time a couple of weeks ago I got this iPad down to about 4% or 3% power, plugged it in, and waited. It reached 100% charged in two-and-a-half hours. I was pleased. Then, while at Mom and Dad’s for Thanksgiving weekend, where they also have iPads, I plugged it into one of their power cords and left it to recharge. Which it didn’t. Returning to it and finding the percentage the same, I went “hmm.” And plugged it into a different cord. It started recharging, but slowly.
I’ve tested recharging the tablet from nearly out (again, around 4%) a couple of times once getting home from Thanksgiving. The first time it took five-and-a-half hours. Wednesday, it took five hours.
Each of these recharges were done while I had wifi turned on, and I know it both uses less power (when unplugged) and recharges faster (when plugged, duh) when that’s off; I’ll test that at some point. But I’m wondering how much this will vary.
As for battery life, I know to look up tips for how to extend it, so this tablet can stay reliable as long as possible. But I don’t know what’s causing the variance.