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.
We have previously underlined in several Fataawa that the time of the Thuhr prayer ends when the length of the shadow of an object becomes similar to its own length plus the shadow that existed at the time of Zawaal (the time when the sun moves from its Zenith marking the beginning of the Thuhr time), according to the opinion of the majority of the scholars, which is the opinion adopted here at Islamweb. This marks the start time of the ‘Asr, contrary to the opinion of the Hanafi scholars who held that the time of the ‘Asr starts when the shadow of an object becomes twice its length plus the shadow that existed at the time of Zawaal.
Al-Mawsoo‘ah Al-Fiqhiyyah reads: “Scholars held different opinions regarding the end time of Thuhr prayer. The majority of the scholars held that its time ends when the shadow of an object becomes similar to its length plus the length of the shadow that existed at the time of Zawaal. The famous opinion narrated on the authority of Abu Haneefah is that the end of the Thuhr time is when the shadow of any object becomes twice its length plus the shadow that existed at the time of Zawaal.” [End of quote]
Therefore, it is impermissible for the student to delay the Thuhr prayer until the time of the ‘Asr begins, when the shadow of an object becomes similar to its length. He/she may perform the prayer anywhere in the school; the entire earth is a Masjid (place for prayer) and ritually pure to perform the prayer thereon. As for the students who follow the Hanafi school of Fiqh and believe that the time of the Thuhr lasts until the shadow of an object becomes twice its length, we do not make difficult for them what has been made easy if they choose to pray the Thuhr right before its end time according to the Hanafi school.
Allah Knows best.