If I plan to make 5k to 10k through gambling, then my bankroll could be lost. When I bet to win for sure, I lose. I cannot be sure even in the bet where I have a high chance of winning. But one thing is that there is no quick or fixed time for winning in betting, so it is not possible to say when 10k will happen. Again, if you are a gambler, then 10k is not difficult to happen at any time, especially for games based on luck. If you have good luck, then you will win even if you bet with a small bankroll. Although some people do not feel very comfortable betting if their bankroll is not large. However, there are many who do not take much time to lose all their money even with a large bankroll.
It's gambling right? there's no assurance at all, more on risking your money but if luck permits then you may able to earn and increase your bankroll, it's more on how you control yourself and how you manage your emotions, as inside this venue it's you who will decide your fate, just like what you said as even as how high is your confidence with your bet chance of losing still present, there's no accurate and there's no fix time in achieving such goal depends on your luck and your good control avoiding being burned and lose all your bankroll.