is it already running?
You could try to click on “view app” again.. Yes i need some time to wake it up, but not Hours :-)
Resuming an app should only take a couple of minutes. Perhaps there is an error occurring while starting the application. I suggest looking at the live logs to see if you can find anything that’s causing the issue. You can find the live log under Environments.
I have the same with multiple sandbox apps since a couple of days (first noticed 4 days ago).
Won't start, no live log and can't be redeployed because of lack of ‘memory'.
When looking at the Environment page it says ‘Your app "'<name of the app>" is deployed in null.’
Seems like there is really something going wrong.