Thanks everyone for the plentiful replies.

So far, the suggestions I see are
1. 1-3 coins
2. 3-5 coins.
3. 7-8 coins
10. one or 2 people saying 10-25 coins.

Any where I can find historical stats on how many altcoin in the non-top 100, or even non-top 500 altcoins have more than 10x in a cycle? I'd like to consider this probability when making investment decisions.

Thanks again