split 12 times and now equal 74,360 shares. The current value at yesterday's closing price would be over 7 million dollars.
Of course, it's never that simple. First at 22.50/share, a 100 share investment in McDonalds stock would have cost $2250. That doesn't seem like that much today, but in 1965 you could almost pay cash for a new Mustang. The median family income was around $7000. Not many people could afford such an investment. And even if you could, putting that many eggs in one hamburger basket would probably have been ill advised.
So could I have held on to an investment long enough to become a millionaire? I don't know. Ask my bitcoin heirs in 30 years. :)