Same setup as your. Started with codex 2 days ago on a large 3d engine project. Spend at least 20 hours prompting. One time I received a message. Try again in 4

Same setup as your. Started with codex 2 days ago on a large 3d engine project. Spend at least 20 hours prompting. One time I received a message. Try again in 4 minutes. I generally let Gemini create a prompt and then paste it inside codex. For example is asked gemeni to make a plan for a subdivided lod terrain render with shadow map functionality etc. It took codex almost an hour to execute it. Did an alright job. Quite impressed.