Correct investment is lifetime. So even after your 20 days or so it will continue to earn on it. I have a few investments running here as been compounding my interest daily to speed things up a little and maybe after a weeks compounding will begin to take a little out.
Only invest what you can afford to be without. I have chucked some spare coins at the time of not needing so if it makes RIO and + % on top then happy days as it will come in handy. I do plan on putting some more in but right now for me funds are tight and with the BTC value all over the palce it sure does not help matters.
PS to Admin. Will you be adding other cryptos into this as would be nice to be given the opportunity to play with other crypto coins too