How often does the oil need to be replaced ?
Your owners manual has that information posted right inside it. Furthermore, your Chevy has an oil life monitor that turns on a service light or message when the oil needs to be changed.
I really, really hope you have changed your oil several times since the car was new!
I change the oil in my Corolla every 5 k miles. Engine still working after 26 years.
Whenever the Oil Life Monitor reads 10% or once per year, whichever comes first.
The “or once per year” requirement is something that many folks can’t wrap their mind around, for some reason
Personal opinion here, but in high humidity, salt air, like where I live, I would not go more than 6 months.