So how long will the 800mah Lipo last - hours, days, weeks or months?
nNode with a RFM95 Lora Bee sending Temp, Humidity, and Pressure from a BME280 every 5mins
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days.
At least days until you go and open the box to make sure it’s still there 
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Nah man, it uses mythical radio wave white man’s Lora magic to give me the numbers so I don’t have to open the box.
I pick months for the battery.
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Are you putting the BME280 into standby mode during those intervals? There are no leds or other current hungry devices on it right?
I’d say 6 weeks.
Its all off while sleeping so drawing 40nA for most of the time.