It took 5 days for my Heltec Lora v3 #meshtastic router node to use up 6.6Wh of one 18650 cell at 5% air utilization rate (one telemetry message per minute). That brings it to 6.6W / 5days /24h or 0.055W (15mA@3.7V) on average.
Importantly, this node was also powering a #INA219 sensor which was doing the power measurements every minute.
Now I'll be doing a reference measurement without the INA219 and with zero telemetry.