Is there an execution time limit for flows? And also, are standard ”when” delays persistent (so that they survive
app/Homey restarts) - I’m guessing no? Asking out of curiosity; I always use the Countdown app for delays longer than a couple of seconds.
Guessing you ask for Advanced Flow’s ?
No, up til your Homey restarts…
No, user other Timers 
I’m asking about both types of flows (standard+advanced) - is there a difference with regards to timeout/execution time limits?
All flow cards are the same for the regular and advanced flows, most if not all timeouts are determined by the device and/or app, so there can be no difference.
In the end the only difference will be the added up time when you put up cards after cards (serial activation) for advanced flows, instead of parallel activation that happens in regular flows.
But it will continue running as long as it is in that flow (not persistent on reboots as said before)
That is correct.
Interesting, where did you find this? Is it documented, or through experimentation?
