Iʿtikāf of the Month of Ramaḍān in the Masjid

In the recent past on the Indian Subcontinent, we have seen that among
our elders, the first to perform the iʿtikāf of the whole month was Shaykh
al-Ḥadīth Quṭb al-Aqṭāb Shaykh Muḥammad Zakariyyā Muhājir Madanī
(may his secret be sanctified) in Saharanpur, in the 1960s. Since then
until the present day, this practice of performing iʿtikāf is still prevalent
there. The iʿtikāf that Shaykh  used to perform in the blessed month of
Ramaḍān was a result of his intense desire to habitually proceed in life
with the thought of the Leader of Both Worlds  at the forefront of
his mind, and to focus solely on him.
This iʿtikāf during the whole month of Ramaḍān was a sunna of the
Leader of Both Worlds , although the iʿtikāf of only the last ten
days is an emphasized sunna (sunna mu’akkada)