1.maybe 16hours?? in weekends of course 48H

2.in the future yes...

3.hhmm i only need change GPU and this card cost me 400-450$
4.now in poland there is 0,61 zł so in dolars it will be 0,20$/kwh in 1day it will be 5-4,50$
5.i know that difficult can change

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6.for example emeraldcoin (calculate on coinswarz) 0.000129
i know that guarantees can change don't worry

)