I think the highest annual return in long run that is known by public is Medallion Fund by Renaissance Technologies earning 35% after fee(actually it is 80% if we don't count fee)for around 25 years.
http://en.wikipedia.org/wiki/Renaissance_Technologies
Here is a news shows it is around 80%:
http://www.bloomberg.com/news/2013-...o-shield-profit-from-taxes-draws-irs-ire.html
Its flagship Medallion fund has returned about 80 percent annually before fees since 1988, according to the Bloomberg Billionaires Index.
Another news:
http://www.nasdaq.com/article/how-to-invest-like-the-worlds-most-expensive-hedge-fund-cm269533
Simon's flagship fund, Medallion, requires aminimum investment of several million dollars and charges a 5% management fee and a jaw-dropping 44% performance fee. The fund is closed to new investment and has returned an astounding annual average net of 38% (remember, that's after the high fees). Since its 1988 launch, the fund has lost money in only one year, 1989, which saw a drawdown of 4%.
So there is a guy in a popular local forum claims that he constantly earns over 70% per year. He sound like he keeps improving to over 100%. He only day trade local index future. He buys and sells average around 3 rounds per day, and the index is just normal 9am to 4pm kind of trading hours but not like US future 24 hours a day kind. He uses IB to automatic the day trade process. Base on what he showed before, his way is trend following, and somehow he can get in the trend very early and leave at right timing. He uses second as time frame unit to do analysis.
He definitely sounds like he knows what he is doing and he knows how to use IB well. He is a full time trader and gave up a good financial job to do that. He has a lot of professional financial qualification.
For other giant famous hedge fund, I find out the average performance over long term is not more than 15% per years:
http://www.hedgefundintelligence.co...-Years-of-Absolute-Return-Top-10-of-2013.html
Personally I don't believe any human can constantly beat or even come close to the 80% mark of Medallion by himself. Since all those big hedge fund other than Medallion Fund can only make 15% the most, while there are so many hedge fund making much worse, I expect a very outstanding individual can only earning around 20% or the most 30% in long run.
What do you think?