Small suggestion on usage duration

[wangshuyu]

1. I really like this project. It's much better than using Codex. The advertisements barely bother me, and I would even click on them voluntarily
2. The daily usage time of 6 hours is somewhat limited. I understand that switching between multiple accounts can bypass the 6-hour restriction, but could we consider introducing a paid model, such as $5 or $10 per month, which would not impose any usage time restrictions