I started my commodities trading on Monday with 791 million ISK and a general thought of "let's turn it into more ISK". With about 30 minutes of effort (spread in several ~5 minute chunks) for 4 days I've turned it into 934 million ISK, about 18% profit return.
Holy crap. I'm flabbergasted. I mean, I knew I could turn a profit but I did not expect it to be so much so fast. It does help that I have lots of ISK to start with but at this rate I will have doubled my money in about 23 days.
So the real question everyone wants to know is how long would it take to turn 100 million ISK at 18% return every four days into a billion ISK? 10 billion? 50? Well, let me put it this way... in two months it would be over a billion, four months would net you 14 billion, and in one year it would grow to 347 TRILLION ISK.
Now, I'll gladly acknowledge that my experience may not be typical. Perhaps the market is particularly hot or maybe my competition is slow on the draw this week. But still, this is the easiest ISK I've made in Eve.