How much can you earn from it ?
It really depends on how much you are willing to invest.
In 2017 Bitcoin saw a 500% increase in value. In January 1 BTC (coin) was worth under $1000 and by October it rose over $5000. Sometimes there are huge jumps in value you can profit from in just a few hours! Of course the more you invest, the bigger your mining power and by that bigger payouts for you.