MikeCRs post is probably close and at least proportionally accurate.
However, other factors will play and be more determinate as to actual life.
3 wide groove vs 4-6 standard groove?
do you shoot it fast and get the barrel hot and keep shooting?
how do you clean, how often etc?
hand lapped match versus factory barrel?
How hot are you pushing them?
Bottom line, push them fast, shoot fast with hot barrels, overbore cartidges and barrel life is like the gas guage on a big engine car. You can watch the guage go down and you had better be ordering another barrel by the time you put this one on.
John Voenida had 1700 rounds on his 30 Cal Magnum rifle when he set the 1000 yard 3.151" ten shot record at Williamsport several years ago.
It was a Clyde Hart barrel.
The write up was in one of the older Sierra Manuals.