I have made efforts to try to fast for more than one day and failed.  Holy people of the Bible and history seemed to do very long period of fasting , not meaning one day but very many days even past a month. I have been watching one of my Youtube subcriber channels he has been Fasting for Lent. He is known as “boobtubious” (http://www.youtube.com/user/boobtubious). It has been 19 day so far and looking at my clock it will be 20 days for him in a hour and a half. He has been doing a daily video journal almost each day and it has been an encouragement to me to try it.