not enough data in that post to make a good assumption.
I would 'guess' you should get at least 4000 hrs out of a smaller tractor.. say compact in size.. perhaps 45hp and down.. and a utility and ag.. 50 and up.. upwards of 10k. not uncommon to see old iron from the 60's and 70's with 12k on them and going ok.
most of the time , the care and maintenance the machine has seen matters more than hours. also types of use and abuse.
an unskilled operator can ruin a clutch in 30 minutes of use.. or that clutch might survive 60ys of correct usage..
OK...and it assumes the hours reading on the meter is accurate.
I looked at a Ford 2k this afternoon. Judging by the way it started and the sound of the motor at various RPM's, it seemed pretty good. Everything worked. It had a new battery and a fairly new muffler. The motor oil looked dirty and the fenders were begining to rust through where they attach to the tractor frame. The owner said he replaced the head gasket just after he bought the tractor. (he may have mentioned that it was sold with a bad head gasket...but don't remember that for sure) The hydraulic pump was leaking a little and when I pointed it out, he said he'd fix it. The rear turf tires had allot of tread on them ....they looked like they hadn't been used much...there was some minor looking dry cracking going on. He told me the rears were about 8-10 years old and that he purchased them for his uncle. The front tires may have been origninal ..they looked like the standard front ag tires. The 6' Ford finish mower looked OK, although it could use a painting. He said that he also purchased the mower for his uncle. He replaced the mower belts and the blades recently.
He said the original owner was a local board of education and that it was used for cutting grass. He said he purchased the tractor about 10 or 12 years ago for his uncle who also used it for cutting grass on his property. The owner is a mechanic for the local municipality. He said he'd take less than the $3k asking price. I didn't make an offer.