The Ramadan is a month-long fasting of Muslims. It lasts for 29 to 30 days. healthnet federal credit routing code. There is no exact timeframe for how long the Ramadan lasts.There is also no exact date on when the Ramadan starts.The Ramadan is only predicted based on the lunar calendar.he Ramadan is a month-long fasting of Muslims. It lasts for 29 to 30 days. healthnet federal credit routing code. There is no exact timeframe for how long the Ramadan lasts.