Ruis Santos at www.RandomNerdTutorials.com (https://randomnerdtutorials.com/esp32-deep-sleep-arduino-ide-wake-up-sources/) has very complete instructions as to how this is done. I've done it on a TTGO-ESP32 as a weather station collecting weather data and it's been running almost non-stop for 2 years off a solar charged battery.
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RE: Deepsleep on LILYGO TTGO ESP32-Paxcounter LoRa32 V2.1 1.6 Version 433/868/915MHZ LoRa ESP-32 OLED 0.96 Inch SD Card Bluetooth WIFI Moduleposted in Technical Discussion