The charge rate seems to be consistent up to approx. the 95% level,then slow down for the remainder.
Just clocked a charge from 10% to 60% @ about 70 minutes.
So,given that,I'm giving a ballpark figure of 2.5-3.0 hrs for a 95%-100% charge.
BTW,I'm using a 2A SAMSUNG charger that is OEM for the GALAXY NOTE 2.(A 2A charger will not damage a phone rated for lower amperage for charging,as this phone is in the .85-1.0 A range,if my memory serves me correctly).
I saw a few apps in the GOOGLE PLAY STORE that supposedly speed up charge times, but,I'm steering clear of them,for if they can actually override the charging behavior of the phone,who knows if it is potentially overriding safeties to prevent overcharging/damage to the phone.