take a look at those two scenarios. I think #2 is better. Also for S1, you will have to test to see how a Cycle timer functions within a sub-process and how to kill it using a Terminate (assuming it’s possible) – the docs dont indicate the behaviour. If you go with S1, please share how the timer behaves, would be good to update the docs.
also @Michal_S take a look at: Pattern Feedback: Timer Cycle Checking of external systems State/Status. It is a similar problem and outlines some of the different conditions and scenarios.