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
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Personal opinion here, but in high humidity, salt air, like where I live, I would not go more than 6 months.