Can someone explain to me why the year 2140 is the consensus as to when the last bitcoin will be mined?  There are already 16,667,325 bitcoin in existence as of now.  There will be approximately 2M mined in the next 3 years, 1.3M mined in the following 4 years, 657k in the subsequent 4 years and 328k in the subsequent 4 years.  That will already be 20,937,825 by Jan 2033.  The remaining 62k will be mined by the end of 2035.  Can someone look over the numbers and tell me what I'm missing that my estimate is 100 years off from everything I've read?

I've got a question regarding Delta vs WYE 3 Phase service.  

If I understand WYE correctly with 200amp 120/208 service, that would give me 208V x 200A x 1.732 = ~72kW available power.  Each hot leg would be 120V x 200A = 24kW x3 legs = 72kW.

Can someone tell me how that equation works out for Delta service?  I have 240 volts between each of the phases, 120 volts to ground on 2 legs, and 208 volts to ground on 1 leg.  Is the equation 120V x 200A x 2 + 208V x 200A? That equals 48kW + 41.6kW = 89.6kW when adding the phases separately?  How does that translate to 3 phases when trying to calculate total kW?

Unfortunately the building where I'm at has Delta 3 Phase so I'm trying to understand how much power is available with that service.

I appreciate any feedback and/or corrections of my calculations.