I put 150 hours on my pontoon last summer, AFTER I blew the motor (equipped with an hour meter). The Lund gets used more in the spring and fall, but a 6-7 hour day of pulling cranks on the big motor (no kicker) is not unusual. I had to sit down and actually look at a calendar a while back to fill out a fishing survey for NDGF and while I tend to not like doing long runs on either the river or the big lakes, I handily found over 70 days my floaters were on the water. That's the beauty of living where you can boat during any given month of the year.
On either boat, a long run for me would be from Beulah Bay over to Indian Hills on Sak. As neither rig are speed demons, I tend to be near full throttle as I motor from one place to another if the water allows it. That being said, your point is well taken. Of all those hours, even with the tubing and stuff, I would guess 70 percent of the time they are at less than 1100 rpm (about my max rpm setting on the Yamaha/Lund combo when pulling cranks in current). The Toon with the newer Merc probably has a much higher percentage of running time since it's either drifting with the electric, or running/pulling.
The total hours on my Yamaha has been something that I've been curious about the past couple of years. Problem is...it never needs to go into the shop so I never get a printout on how many hours she has. Ok, she's had a water pump done and a stator a couple years ago, but I forgot to ask then.
150-250hrs in the boat/season maybe but I'd bet you don't put more than 50-60 "running" hours on your motors.
My main motor hours averaged 30hrs over the last 3 seasons. I don't do any tubing, waterskiing, wakeboarding, etc just fishing. However, I do make some fairly long runs and fairly often and get 35-40 days/summer on the boat. For the little bit that I pull cranks I have a kicker but most of my fishing is with the bow-mount electric. I'd be really interested to see sometime how many running hours that bugger's got on it.
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p.s. I know there were years where the Lund didn't get a lot of hours. That's back when I fished the Misty Waters and Hoge Island area frequently. At Hoge I was able to motor to the fishing areas using the electric, there were many days where I only started the big motor to trailer the boat. It kinda felt like I was cheating.