ChatGPT offers a free plan that’s always available with no time limits....

https://touch-wiki.win/index.php/Does_ChatGPT_Free_Trial_Availability_Depend_on_Your_Country%3F

ChatGPT offers a free plan that’s always available with no time limits. Occasionally, targeted users may get a free trial of the Plus plan, which often requires a card and auto-renews when the trial ends