I’m planning on running a secondary battery because my headlights are dimming when the bass hits. My stock alternator is rated @ 160amp?

The battery I plan on adding is a shuriken SK-BT 120 120amp hours 2600 crank amps. I have 2 4ohm kicker L5 with require a combined 1200 watts rms. My amp will provide that at 1ohm. I’m not planning on running the audio system with my car off. How long will this battery last me. My amp draws 197.1 amp at 1200 watts rms.
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