I think you're being incredibly conservative @showstring
I see no reason why ohm can't be installed in 50,000 building in 18 months - or even 100,000 - lets face it that is a tiny number of building across US, Asia and no doubt Europe by then.
And still represents a tiny production run for a manufacturer.
Smartphones are being made at a rate of over 100,000 a day. And Ohm is way simpler a piece of kit than a smartphone
Do the maths on 100,000 buildings please.
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