I got somewhere around 7 years and 10k miles out of the first rebuilt one I installed in 2001, Drew. The failure wasn’t catastrophic and the leaking was evident to anyone that opens the bonnet regularly.
It’s not god awful roadside repair on a long trip so a spare makes decent sense. As you saw, I did mine again just because the engine was out, and 150 bucks was not a lot in context of how much I was already spending. However if the engine was not out, then that pump would have stayed in there until it started leaking.