How long does it take for one to walk a mile?
The number is not quantifiable to the point it would give you a true representation. Each individual should be considered a separate case.
I was able to take $10 to $10,000 in 15 trading days.
Person A might be able to do it in 3 days
Person B might be able to do it in 3 months
Person C might be able to do it in 3 years
All scenarios are successful
How do you define profitable?
Person A made $1 over a time period of 1 year
Person B makes on average $100 a month, but still needs to work a job to support him or herself
Person C has a negative 5% a month, but has great trading months from time to time and was able to make profit above the original deposit
All scenarios are successful. Hope it helps.