In light of our recent power-consumption related posts 1 & 2 it seemed logical to ask ourselves about max deep sleep for ESP8266. Yet, it took a comment from a curious reader to set things in motion. I replied
…the maximum value for a 32-bit unsigned integer is 4294967295 or 0xffffffff. Hence, the max deep sleep interval appears to be ~71 minutes.
You can’t argue with that first statement but the second is a bit in the air without clear evidence. My co-founder Dani quite rightly then asked “are you sure, didn’t they change that recently?” (“they” being Espressif and/or the Arduino devs).
So then, what is the current max deep sleep for ESP8266 i.e. the maximum duration the ESP8266 can sleep deeply – and still wake up afterwards.