Is it permissible to pray Fajr for five minutes? And also Asr prayer?

Tranquility (طمأنينة) in the physical pillars of prayer is obligatory according to the majority of scholars. Whoever recites Al-Fatiha and performs the pillars with tranquility, their prayer is valid. Five minutes may be sufficient for a valid prayer, and the most important thing is not to compromise tranquility, regardless of the duration. The greater the tranquility, the better and greater the reward.