i think like 5 bitcoins will be enough, as you should have like 500k$ then
what? of course it wouldnt be enough and in my opinion bitcoin is not going to be grown enough, i would need like 30 bitcoins at least
Well, the amount depends on the satisfaction of every investor, we should think base on our wants and needs in the future because with so much money that we will not be able to spend will become a problem.