ChatGPT offers a free plan that anyone can use without time limits....

https://andysexpertblog.nexorafield.com/posts/how-long-does-a-chatgpt-free-trial-usually-last

ChatGPT offers a free plan that anyone can use without time limits. Occasionally, targeted users may get a free trial for the Plus plan. Some of these trials require a payment card and will auto-renew when the trial ends