We could actually turn this thread into a meaningful discussion as a few poster already did. So let's rephrase the OP question, since the world "mathematically" has no meaning. Instead of that he should have used either theoretically or practically, and those 2 are HUGELY different.
As Laissez pointed out one theoretical limitation could be the daily range. He says the max. is 10x the range. Let's leave it at that.
But what is the PRACTICALLY and consistently achievable max. return? Anybody can have a good day, that doesn't mean it can be expected day after day.
One another thing not mentioned in the original inquiry is the used instrument. Is it futures or options? Obviously it has to be a leveraged instrument because leverage is everything. Options will return more during the same movement but when you are wrong you also will lose more.
And one last thing not mentioned is just how much of the account is committed to each trade? This is a risk/reward question, and since no system is 100%, those few (or not so few) % when it doesn't work can quickly kill the account, thus shrinking long term expected returns.
The biggest returns I have seen where done by using (more like investing) in options for weeks/ months and going in heavily, holding it almost blindly. No day trading was done. I am not saying it is not possible, but practically more people made it big by holding for a longer period...