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VideosQuestion:
In Britain, we fast more than seventeen hours a day. Is it permissible to fast for twelve hours only?
Answer:
All perfect praise be to Allah, the Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad 
is His Slave and Messenger.
is His Slave and Messenger. Allah The Almighty Said (what means): {And eat and drink until the white thread of dawn becomes distinct to you from the black thread [of night]. Then complete the fast until the sunset.} [Quran 2:187]
So, the fast time is clearly defined and imposed by Allah The Almighty in a way that makes it prohibited to be lengthened or shortened.
Allah The Almighty legislated the fast for very important rationales including refining His slaves’ souls and hearts and purifying themý from evil. Allah The Almighty Says (what means): {O you who have believed, decreed upon you is fasting as it was decreed upon those before you that you may become righteous…} [Quran 2:183]
Thus, Allah The Almighty did not ordain the fast to torture or trouble His slaves.
Before being imposed in the manner that it is, the fasting would start not at the crack of dawn but after the ‘Ishaa‘ prayer or if one would sleep after sunset. However, Allah The Almighty had mercy upon this Ummah (nation), facilitated the fast and allowed us to eat and drink all night. What could be easier for you than what Allah The Almighty has made easy?
Therefore, what you have suggested in your question is absolutely prohibited because it is tantamount to a manipulation of the religious assignments and a transgression of the limits set by Allah The Almighty who says (what means): {And those are the limits [set by] Allah. And whoever transgresses the limits of Allah has certainly wronged himself.} [Quran 65:1]
Moreover, reward is proportionate to the difficulty of the act of worship; the Prophet said: "Whoever fasts Ramadan out of faith while seeking its reward from Allah The Almighty, will have his past sins forgiven." [Al-Bukhari and Muslim]
said: "Whoever fasts Ramadan out of faith while seeking its reward from Allah The Almighty, will have his past sins forgiven." [Al-Bukhari and Muslim] Indeed, seeking the reward of Allah The Almighty means that you do not think of the fast as something heavy and difficult and you do not feel annoyed about it.
However, if a fasting person finds that it is unbearably difficult for him to complete his fast to the extent that he may die or something of the like, then, it would be permissible for him to break his fast and then refrain from eating again until the end of that fasting day and then, later on, make up for that day.
We ask Allah The Almighty to guide all of us to the right path.
Allah Knows best.
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