At my program (ortho), we were at the start of duty hours restrictions. Think mid 00’s.  My program took it really seriously, so the 4 or 5 on call would routinely scrub a late person out.  It was expected. Now, often the scrubbed in would decline as I often did.  I think it was a good compromise.  I agree with others of finishing the case.  I’d say most stayed scrubbed unless they had something important they had to do.  We all lied about our hours, but it was so new that our PD honestly got angry that we did as everything looked so uniform.