Thank heaven he finally listened to you! Now at least you will have access to another cardiologist, albeit in another state!
I have worked in pedi heart surgery but it has been a long time
ago. My guess would be that he would only be in a couple of days, unless they have plans for a more thorough evaluation, which might be likely. Kids bounce back quickly, typically. We would have some that had simple open heart surgery and would be happily playing in their crib in 2 days, asking for soda!