Ten years isn't enough to safely "invest well" — you could be buying the next Apple or Google, but for all you know, you might be buying the next Theranos or We

Ten years isn't enough to safely "invest well" — you could be buying the next Apple or Google, but for all you know, you might be buying the next Theranos or WeWork. If you diversify, ten years likely won't give you that big a bankroll unless you start out with a fairly-hefty one. EDIT: And even if you do diversity with a hefty bankroll, you could be investing in, say, late 2007, just before the start of the Great Recession and its attendant massacre of so many stock prices — or in February 2000, just before the dot-com bubble started to deflate (a painful memory for many of us).