How effective is this?

Hi all, I just stumbled across the FSI materials and before starting to try to learn French, I was wondering if anyone has successfully become fluent in French using these materials and how long did it take? I've taken a year of french at a university but when traveling to France quickly realized I was completely unable to communicate or understand people
so I'm looking for a more effective learning method.
Also, the audio recordings all seem to be around 25 - 30 minutes long. Is it sufficient to listen to 1 recording per day to progress? (that would only be about 30 minutes per day of practice) Should I be spending more time than this?

Also, the audio recordings all seem to be around 25 - 30 minutes long. Is it sufficient to listen to 1 recording per day to progress? (that would only be about 30 minutes per day of practice) Should I be spending more time than this?