How can one make up for five years of missed prayers due to negligence, and is it permissible to make up several days' worth of prayers in one single day at all times, including the prohibited times? Also, what is the manner of whispering and vocalizing in made-up prayers, especially for prayers that are usually vocalized but are being made up during the day?

According to the majority of scholars, missed prayers must be made up intentionally, which is more cautious, and it is permissible to do so during the times when prayer is ordinarily forbidden. As for reciting aloud or silently in a made-up prayer, there is a difference of opinion, but the preponderant view is that the original manner of the prayer should be observed.