السلام عليكم ورحمة الله وبركاته احسن الله إليكم How much sleep should be enough for a student of knowledge with little time?

This depends on how many hours you need a day. Give your body what it needs: 1. If it needs four hours and that is enough for you, then sleep four hours. 2. If it needs six, then six. 3. If it needs eight or nine hours, then sleep eight or nine hours. Whatever your body and health requires, you should provide, because this has some very serious health ramifications. It causes health problems if you don't get enough sleep.