And if it does how much time does it take to pay off equipment and electricity.
Isn't it simpler if you trade cryptocurrencies instead of mining them?
On the second question.... YES!!! Its nothing compared to knowledge you need to mine.
Question about paying off should be only you to answer yourself based on your electricity price, coin you mine and scale of operation.
This is professional business with huge players and amateurs have to be REALLY prepared well to have any chance in that market.
Easiest is to just buy and hodl or trade.