Minimum time to know if will work WiFi.connect

In the circumstance where a WAP is off at startup - a Photon will now (OS 2.2.0) try to connect and then disconnect.

This then means if the WAP is turned on later, a process is required to reconnect WiFi (if using Semi_Automatic mode).

If the following is used on a timed basis (every minute or so) then how long does the timeout_period need to be to have certainty of reconnecting to the WAP?

I want to make this as short as possible since this is blocking on the application thread. Or is there another way to have a non-blocking reconnection?

waitFor(WiFi.ready, timeout_period);

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