I took pictures for my friend and told her I’ll be really busy till a certain date and she can expect the good ones after that date and she was okay with it. I also let her have access to the unedited ones because I was going to complete going through the pictures late but those were our agreed terms and that’s the only time it’s okay.
You’re right about grace, but the person needs to speak up about their availability in being able to the job they signed up for. If you knew you had finals and packing and graduation. Don’t take the job. If you can’t juggle what you signed up for you had no business doing so. And most photographers let people know how long it takes them to edit and send off their pictures.