What size elec trolling motor for 14'?

[flygoddess]

We have a 14' Aluminum and we use a 45 lb thrust. We can get about 3 to 5 hours at variable speeds on a large 29 deep cycle battery from Walmart.
For long days, like Jim said, we have a gas motor that can charge the battery while running. Our motor is an older Honda 9.9
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