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My new iphone 6s has been charging for 24 hours and is only at 68%
Welcome to iMore! I suggest contacting Apple Support or taking your iPhone into an Apple Store. There is a recall on some iPhone 6s devices due to battery issues. My wife's was just replaced because it stopped holding a charge.
You can check to see if your device is impacted by the known battery issue here. Either way I'd take it in and have it looked at.