In fairness, all three which PurplDodge mention are commercial engines with price tags to reflect the same.Kohler Courage, Kawasaki, and Vanguard all beat the Endurance.
I dont know a thing about the Endurance engine but I was getting about 7 to 8 years out of the older flat head briggs engines. This was before the better ones came out like the Vanguard ect..... I would estimate the hours to be in the 400 to 500 range before they were shot. Bear in mind these were the cheapest briggs engines ever made. I changed oil, kept the filters clean ect and tried to take care of them but I also ran the **** out of them. So, you are pretty much spot on.In fairness, all three which PurplDodge mention are commercial engines with price tags to reflect the same.
Well cared for and used within design limits, you can expect 7-10 years out of your endurance. Abused, you can expect two seasons out of it - maybe.