Just checked mine and I've put on 197.5 in 18 months.
As far as translating the hour meter to wall clock, they are not the same. It depends upon the engine speed. A quote from my JD4100 handy-dandy Owners Manual states:
<font color=green>Hour Meter - Shows the number of used hours the engine has run at 2650 rpm. If engine has run at less than 2650 rpm, the indicated hours are less than the actual running hours. Use the hour meter as a guide when servicing various components of this tractor."</font color=green>
Used the proper green color since it's a Deere.... /w3tcompact/icons/wink.gif/w3tcompact/icons/eyes.gif/w3tcompact/icons/laugh.gif
So... with the quote in mind, you have actually spent more time in the seat than you think. The only time I run my Deere at full PTO rpm is when I mow, use the rotary cutter, or the rotary tiller. There are occassional times when I use the FEL when under heavier use, but that is infrequent. Example: I used my rotary cutter to cut an 11 acre field last week. I put on 14.1 hours on the hour meter - most of that time at 2400-2500 rpm. I probably had nearly 16 or so hours on the seat. My body can attest for that... /w3tcompact/icons/grin.gif
Terry