Intermittent fasting question

I was wondering if anyone has lost any weight while intermittent fasting. If you have, how many hours a day is your eating window? I have seen that there are different window lengths recommended for different ages. If I were to follow what is recommended for me, I would eat for 12 and fast for the other 12 hours a day. I have tried this for about a month and a half and have had no luck. Maybe I should try 8:16?