I'm not sure there is such a thing as "normal" for this phone
. I've seen people report everything from a mere 10-15 hours with normal use (ie. perhaps including a couple of hours of screen time) up to some claiming they get several days on a charge.
The first couple of months I had mine it would drain almost exactly 1% battery per hour on idle, but with normal use I still counted on a daily charge if I was actively using the phone for more than a couple of hours.
The last two weeks it's been draining around 3% per hour on idle. With around three hours of screen time the battery can stretch to perhaps 20-24 hours.
The extensive battery stats from Battery Monitor Widget Pro (which I installed a few days ago) doesn't really reveal what's causing the increased drain during inactivity. I see nothing unusual in the stats regarding awake time or any visible processes taking up unusual amounts of CPU time.
Anyway, a daily recharge is fine with me. But if battery drain should mysteriously increase further I'd obviously be somewhat less pleased.