Usually about 2-3 hours with the extended battery, but if I leave it on for a couple extra hours I find that it will take much longer before I need to recharge. This to me shows that the rating of 100% charged isn't accurate.
I haven't found any of the battery apps to match up to the claims their ads proclaim. even so I use NQ Android Booster. It seems to work as well or better than the rest of them and is very easy to use. The biggest benefit is that it is free and you can never beat free.
The answer depends on some things you didn't mention in your post-
How much charge is on the battery initially when you plug it in?
What are you using as a charger- the OEM or an equivalent with at least a 1A output (for max-rate rapid charge), or a standard USB charger or PC USB 2.0 port with less current output (slow-rate charge only).
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