All of our Fly apps in production except one have multiple machines. Our downtime has been caused by other issues, not machine failure.
That app with a single machine does not respond to HTTP and the [[services]] section is empty. It basically responds to triggers in the DB and performs long runnning and scheduled jobs. If it goes offline for less than a minute it’s not critical but it’s not designed to work concurrently. See this incident from a couple of days ago.
Yeah 30 days is too much. A week maybe?
If it was up to us, we would have migrated to the new host 1-2 days after we received the email.
When the migration officially started we stayed up until 3am thinking it would be a faster process 
Even 2 days later it seems none of our apps have been migrated.