Did you hear sound at all ? Got the earplug connected well?
If you are out of the zone you should get an immediate warning to speed up or slow down.
If you then get back in the zone you should get a confirmation immediately by the message "maintain zone".
If you do not get the message maintain zone, it means you are still out of the zone.
I am not sure how often that is repeated, I never measured it, but I would guess every minute or so.
But you can be sure, if you got the message to speed up or slow down, and then nothing else, you are still in the wrong zone and you should follow the last instruction.
