Learning a language can be very expensive. Not only the money you paid to school or your tutor, but also the time and energy you committed.
If you started with two weeks program, and four weeks later you forgot everything, all the effort your have made is wasted! It's better that you didn't start it at all. You can use the money, the time and the energy to do something more beneficial, like go hiking or read a book.
My advice is that if you are not sure, don't start. If you have committed, you should carry on for more than one year to not waste anything.
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