Electric Motor on Pontoon, Questions

[Hunt4BigBucks]

I am thinking about getting an electric motor for my pontoon, I am thinking about getting a minn kota endura 30 pound thrust. This should be enough to troll with shouldn't it, and how long will a battery last if the motor is used to troll with all day? I saw a guy in an aluminum boat yesterday with a 30 lb thrust motor and he said he can troll all day long without running out of power. So another question would be, what is a good deep cycle battery to use. Thanks
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