I don't think very long if u use the trim tabs and motor trim much and
starting all high amp draw, I broke a belt one day and was putting the trim
up and the motor died, lucky for 2 batteries and running on one. get a
rebuild for peace of mind. GL

"Gfretwell" wrote in message
...
I'm taking the alternator to the shop on Monday, but I'm wondering if
this is unusual. Should I be able to run around this long on a
two-battery bank with what appears to be a shot alternator

If you put it on a charger when you get home and don't run a trolling
motor it
will run forever.