For a 4 foot one maybe 8 minutes. For a 5 foot one 10 to 15 minutes. 6 foot 20 to 25 minutes. 7 foot will run you 45 minutes and an 8 foot + will go 50 minutes +. If you hook a 7 to 8 foot fish in the tail or belly you got your self 1.5 hours no motor. With a motor you can use the electric motor to fight and you're back to 1 hour.They fight hard. Here is a video of a very close call.

http://youtu.be/iUIfTAOZx2w?list=PLH...6c5NlloH3jd5wb