I'm glad you got a second opinion that confirmed the first assessment. I know that waiting can be unsettling. But you can take confidence in your diligence in following up. It might also help to reassure you that it may be something benign (non-cancerous) and if it is cancerouse, colon and rectal cancers grow slowly over many years.

You might find this information helpful.
- How Long Does Colon Cancer Take to Develop? https://moffitt.org/cancers/colon-cancer/faqs/how-long-does-colon-cancer-take-to-develop/

I'll be interested what you learn in a month's time. Do check it if worry gets the better of you in the meantime. 🙂