You can't expect a guaranteed profit with your given timeframe no matter what strategy will you do. Scalping, like with other trading strategies, will rely on how the price will behave plus the fact that every coin has different behaviour. The output of it will depend on how well you executed it.

For the amount you have mentioned, definitely yes. It's enough.

Since you are now currently trading, then why not just test it and see the result for yourselves.

More importantly, don't set a target period where your money should be doubled but instead, focus on winnings at any cost.