They’ve got to learn lines (long enough to film them), develop character (strongly enough that they can film completely out of order with consistent characterization), and rehearse (most films have at least a few days of rehearsal). They are also negotiating payment and figuring out their next work.
Can I wear jeans to an audition?
You don’t need to dress like you’re going in for a corporate interview here. Your clothes shouldn’t be a wrinkled mess, but you also shouldn’t be wearing business attire to an audition. A good pair of jeans can go a long way, and it’s worth investing in a pair for auditions alone.