i would like to use the rtc widget on my hardware (d1 mini pro). however, the board is working mainly in offline mode (not sleeping, just the wifi is turned off).
my question: if - at startup - blynk is allowed to run for 1 minute and rtc is updated, then i disable blynk.run and turn off wifi, for how long it is possible to use the rtc?
i mean, for how long will
timestamp = String(hour()) + "." + minute() + "." + second() + "> "; return a somewhat accurate value?
or is there a limit if not able to connect to server for a certain amount of time, will break the rtc functionality?