I'm still getting caught up with all the threads from when I was out of town. I'm so sorry to read about Max's parvo
I also would go see my baby if I wanted to. It would help you to actually see him. If that's not possible - then I'd leave a message for the vet to call me. If I hadn't heard by 3:00 that day, I'd call back every 30 minutes until I got him on the phone - but that's just me and I'm not a patient person
When my children were very little we lost a puppy to parvo and it wasn't pretty. He was at the vet's a week and suddenly took a turn and we lost him.
I'll be praying for you and Max.