I have found that proper clean and care of my brushes (I love all of them and have a hard time when I need to change them) help to last them longer.
Thant's why I want you to start care about your brushes as soon as possible.
These steps are quite easy to follow:
1. Clean brushes gently with a water.
2. Use a soap. Rinse with water.
3. Dry bristles with a paper towel shaping them as you dry.
4. Lay brushes flat to store.
And good luck!