Two more months will put you over. But I know of no reason why it shouldn't, either. Actually, I'm pretty sure it won't. If it does, it will be sheer coincidence. A compounded average annual return is only meaningful over multiple years.
Individual years vary widely.
10 is better. One question I get asked a lot has to do with portfolio allocation. That's a hot topic amongst the Wise. That said, I know that deciding on how much to put into stocks in general or the Foolish Four in particular is a big decision. For some people, the Foolish Four represents their first foray into owning stocks directly and feels like the riskiest part of their investment portfolio.