How long until I can jam with my buddies or play with a band?
Everyone learns bass at a different speed, so there's no one answer to this question.
You can complete the Beginner to Badass course in as little as a month, or as long as 6 months, depending on the practice schedule you choose for yourself. By the end of the course, you will definitely be ready to jam and even join a band.
If you're working your way through the course, you can still try jamming with other musicians, but you might need to rely on their expertise and help to get through the jam in one piece. :)