Electron: Calculating approximate mAh required to wake up and send small data payload

I’m designing a device based on Electron and I want it to be able to periodically send an “I’m alive” message, then go back to deep sleep. I would like to know roughly how many days my battery would last if I did one of these messages a day. I realize there are various factors that could affect this, but I’m looking for a ROM. Thanks.

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I’m also interested in the answers that you get.

I can tell you, from my experience, that it overwhelmingly depends on the Cellular Signal Strength at each project site. My trials have ranged by a factor of over 2.