You can read online how often correctable errors happen to people with ECC and reporting.
Single digit - sometimes none - errors per year in systems with consumer amount of RAM.
Single digit - sometimes none - errors per year in systems with consumer amount of RAM.
One time I took a working workstation from my home to my parents' home to give them. When I booted it up it gave a lot of strange kernel errors which I googled and discovered were reports of ECC correction. I reseated all DIMMs and it was fine. If that gave errors a few times a year instead of thousands of times on the first boot I wouldn't have noticed.