I just put two interstate group 29's "i believe" in my boat this spring. They have around a 190-200 RC. The boat is a a 2072 Alumacraft with a 75pd thrust motorguide. I have trolled up to 6hrs on them, and still did not run out of battery. I always plug the boat in to charge as soon as I get home with my minn kota 345 onboard charger. I dont know how many hours they would pull at trolling speed as I have not ran them down yet. My 2072 Alumacraft has a large footprint, so it has a lot of drag in the water. I would think with you having a smaller boat and 15-20% less RC on your batteries, you would get similar run times as mine.