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Which iPad and OS? Are you charging via a wall charger or via USB? Also are you charging via the official cable?
All these can make a difference. Mine never takes that long even from a totally dead battery. I use official cable to a wall charger.
As a matter of fact I just plugged it in. It's completely dead. Let me see how long it takes via wall charger for an iPad 3 Retina starting from 6:00 am.
Thank you for reminding me to charge it!!!!!
Sent from my SEXY GORGEOUS AWESOME GOLD 128G iPhone 6 ️️️
It should definitely not take 12 hours to charge