COMMENTARY on 29:54
A. Yusuf Ali:

Translation:
They ask you to hasten on the Punishment: 3486 but, of a surety, Hell will encompass the Rejecters of Faith!-
Commentary:

3486  The challenge of the wicked for Punishment was answered in the last verse by reference to Allah's merciful Respite, to give chances of repentance. It is answered in this verse by an assurance that if no repentance is forthcoming, the Punishment will be certain and of an all-pervasive kind. Hell will surround them on all sides, and above them and below them.