Shadowing for 6 hours?

I’m interviewing at a different icu. After my initial interview, they emailed me and asked to do a shadow shift to see how the unit is ran. They said it would be from 7-1. 6 hours seems a little excessive or is that just me? Because I thought shadow shifts, you don’t do anything. Isn’t that a liability if you touch a patient and you’re not an employee or a student?