how long it take to become an astrobiologist?
Before becoming an astrobiologist you need to select a particular course for it , generally it takes about 3-4 year to become an astrobiologist ,as it depends upon the related course of it, you can have a tag after completing your course but in actual you will be called an astrobiologist if you have proper skills too, so there is need of focus also.
Best of luck.