Not often. I still use ones from 10 years ago. The only reason I typically buy a new one is because I'm relying more and more on USB C charging and things like my Steam Deck and laptop require a relatively high wattage
You get what you pay for. I go through an assload of cheap Five Below USB chargers but the good ones that cost an arm and a leg that come with phones last forever
Slightly off topic, but if you’re staying at a hotel and forget your charger, go to the front desk and ask if they have any extras. People tend to leave them behind, so the hotel usually has spares.