Presumably it is possible to double an account in a year but it only works for smaller accounts because the strategies do not scale. I am looking for opinions on the upper limit on the account that could be doubled with a reasonable certainty in a year. By "a reasonable certainty" I mean something like this: each year you start with 10K, in 5/6 years you make 10K or more, in 1/6 years you make less than 10K but don't bust your account.