Fortrex bow mount trolling motor with lift assist, 80 lbs thrust, 24 volt, 45 in shaft, excellent condition, used about 15 times a year on my Alumacraft Classic boat, 2015 model for sell for $650.00, new cost is about $1300.
I would think one could trolll for a hour, then you might have to run it at higher Rpm for a few minutes before going back to trolling. A dealer might know more.