Too much is more than you can afford, GTI. Stay within your budget. Enough is what you can afford to buy, and loose. Your budget should not exceed what you can afford to lose all of, every single cent, if everything goes wrong.
"Plan for the worst, hope for the best." is the correct strategy.
By the way, that figure, 15.5 million shares, is just about what I hold.
But I am me, you are your own person. Make a plan, and stick to it. In the long run that is valuable advice.
"Investors get rich, hogs get slaughtered." That's another good thing to remember.
Good luck, GTI.
Don't take my word for it, Do your own research! Then you will know it's true!