How much money you want to flush down the toilet.
This exactly. The size of your bowl. OP, don't fall for this shit. Everyone on this forum who 'invests' in ICOs is looking to do the same thing, which is get in early with the hope that the devs of whatever particular coin aren't complete liars. But they're all complete bullshit coins that have no advantage over bitcoin OR the 1000s of other shitcoins on the market. Just stay away. Far, far away.
But there's lost of money to be made flipping ico's if you get in early and out on time. Even holding some long term paid off like with waves and with eth.