There are a few factors that affect how long it takes to get minutes:
Internet speed - how fast can you upload your meeting recording?
Recording length - how long is your meeting?
Assuming reasonably fast internet, and a meeting recording of 5 hours or less, then you should see meeting minutes after about 5 minutes of waiting.
If you are waiting longer than 15 minutes, then that is very unusual, and you should reach out to support.