My entire biopsy took less than an hour, and it is the best biopsy you can get.
In fact after the biopsy the surgery shoed the biopsy got all the cancer, the surgeon just tok extra margins and they were clear
You should certainly page through this forum and review all the great answers and advice.
80% of the time the clusters amount to nothing. It is the 20% that it is something why we agree to the biopsy.
Mostly, the biopsy is incident and certainly painfree. It takes under an hour including prep time. The actual biopsy itself is only about 15 minutes.
I had results in about 3 days. It is best to not worry too much or freak out before you actually get results.
Good luck tomorrow.