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No more than 5-10 percent.

I think that more aggressive crypto users should keep 50 percent of their portfolio in "blue chip cryptos" such as Bitcoin, Ethereum, NEO, Monero, Dash, and so on. Pretty much any coin in the top 25-50.

25-30 percent should be used for coins in the 50-500 range that seem to have a good use case or platform but just haven't dropped yet or are still trading for what you feel is undervalued.

The rest should be spread for ICOs and then if quick profits are made, reallocate half to big cryptos, 25 percent to lower, and then 25 percent back for ICOs.

Less aggressive investors should keep 80-90 percent of their holdings in big cryptos and use the rest for smaller cap coins and ICOs.

Everyone is different though, and only invest what you can afford to lose. Also, always do your own research into the whitepapers and never just take someone's advice. I have an educated opinion on what will happen next in the market but I am no financial advisor! :)

Cheers!