Hello @drittich
how is your experiment going? I ran a similar experiment where M5Paper would wake up every 10 minutes, connect to WiFi, make an MQTT call and then shut down again. Battery started at about 4772 and ended with 2920. It managed to wake up roughly 1200 times. So in my case it lasted about 200 hours. Now given that most energy is consumed when awake this numbers could also model your use case, e.g. 1200 times woken up, twice per hour would give 600 hours or 25 days.
BTW: I assume by deep sleep you actually mean shutting down and wakeup from RTC, correct?
Thanks
Felix