How long does it take to queue manual run scraper?

I’ve ran my scraper before and the manual run starts nearly right away. However, I just updated the scraper and would like to test run it. It has now queued for 2 hours.

What is the queue meaning? Is there a problem with my scraper script?

Otherwise, how long does it usually take to queue?

The scraper is queued to run. It was queued manually about 2 hours ago.

Edit: It has now queued for over 20 hours.