I'm surprised how few hours I've put on the (mechanical) meter in 2+ years, total about 50 hours. But this understates seat hours because I nearly never run at rated rpm.
Typical use is grubbing out blackberries moving dead-slow because of scary slopes, road grading with lots of stop-and-look between hard pulls, and cautious loader work. For the occasional mowing I run about 3/4 of rated pto speed because I'm still finding debris. (worst example is cinder blocks that Dad stuffed down gopher holes!) It's not unusual if I'm on and off the tractor all day to see only 3 hours on the meter and 2 gallons of fuel used.
I've completed most of the landscaping projects I bought it for so at this point could get by with a smaller tractor sized to run a 4 ft mower, so long as it had a loader.
I have no idea if this use is 'average' for a homeowner CUT. I don't have the lawns that a suburban owner maintains, so I expect my long term use will be fewer hours than average.
Chip, what are you seeing on your customers' tractors?