In my laptop i've a graphic card that has more or less 10Mh/s rate for ethereum (Nvidia Geforce GTX 950M)
From the following link i've found a formula that gives me a 1.57 day for find a block.
Instead from the tool from etherscan.io I get a result of more o less 345 days.
Which is the right formula to extimate the time for me to find a block?
If can be usefull, I will use geth