Building A Bluetooth Speaker

Iam planning to build a rich bass speaker, but really want to know I'd my component marched to each other to give out a sound powerful delivery.
1. 50w × 2 dual channel amplifier( 12v)
2. 50w x 2 full range 4" bass speaker.
Then the challange I am having how is the find out how many lithium battery I can use to will last at least 5-6hours play time. Pls I am patiently want for any advice that will help this my project.

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chuks ogbu
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