My friend got to final interview, but didn't get in. She reapplied 5 months later, and got a rejection letter, without even an interview. If they say 6 months, they mean 6 months. I know it is frustrating, but it is for a reason. It is verry difficult to improve your skills, and experience in lessthan 6 months. Most airlines say 12 months... so it's not that bad.
A key attribute of a good cabin crew member is patience...