During the 6 weeks of BC you'll be hourly so you have to get as close to 50 hours to get expected salary. For 2-3 days you'll be in a classroom setting for maybe 8 hrs. It can run less so you'll have to make those hours up at the store if you want to meet your expected salary. In class you'll discuss some HR stuff, lingo, expectations as ETL, AP crap, and learn the latest catch phrase. When you get to your training store you'll be assigned a trainer. You will shadow this person's schedule. Days, mids, closing, clopens, etc. You'll be given a learning plan to follow. It's very informal and the only person that cares about what you learn is yourself.
For 6 weeks you will use the learning plan as a guide to see where you are. If you catch on quickly then you'll be done with BC in 6 weeks. If not you'll stay longer or they will fire you.
BC can be a joke or very helpful depending on your trainer. Some just have you do TM crap or physical work rather than learning how and why.
The real lesson starts when you're in role and your store does things a lot differently than how you were trained.