Is it possible to set a timeout for the maximum execution of an app or does this have to be done programmatically?
As of today, Fly apps cannot be serverless, there’s no set execution time limit. For serverless-esque semantics, you may have to wait till Fly machines become a reality.
Until such a time, you may have to rely on tricks like scaling your app down to 0 (ref1, ref2) after you’re done executing.