Lipo battery flight time estimate help needed :(

I'm getting conflicted answers on the below setup, and was wondering if someone could help me once and for all.  My setup goes like this:  SK450 frame, NTM 2826 1000kv motors (9x4.7 props amp draw of around 12A), naza m V2 w/gps, 9x4.7 or 8045 props,

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