2Mil its too big amount of money. If I have 2M the half will investment in mining bitcoins and the half of the amount will buy bitcoin and hold I after in many years and sell if the price is double or triple your money.
I've heard that in 3 to 6 months, you can ROI from mining depending on the electricity bills in your country. That's why you have to compute first how much are you going to make with mining. I think that if you found bitcoin mining profitable, then better invest more money to it because it will increase the amount of your bitcoins and that will double your profit. The growth of your bitcoin is coupled by the increasing price of bitcoin in exchange to fiat.
That is a truly enormous quantity to make an investment but I would propose you not to spend total cash in bitcoins as it can be a enormous danger if value goes down in foreseeable future so you can invest some volume in bitcoins and relaxation can be diversified in gold and silver which is regarded as an risk-free investment as it will by no means vanish in potential and even value can go higher in long operate.
Time has proved that it's good to buy gold in order to store your money. But time has also proved that the price of gold and silver aren't going to skyrocket anymore. It has been there for a while. With the price of gold being constant in exchange of fiat, you can't even save yourself from the inflation of your fiat currency. You need something that will increase its value after some time like bitcoin. You don't just invest at something. Invest at something that will gain you profits.