REMAIN, then, [O believer,] patient in adversity, just as all of the apostles, endowed with firmness of heart, bore themselves with patience. And do not ask for a speedy doom of those [who still deny the truth]: on the Day when they see [the fulfilment of] what they were promised,42
[it will seem to them] as though they had dwelt [on earth] no longer than one hour of [an earthly] day!43
[This is Our] message. Will, then, any be [really] destroyed save iniquitous folk?44
I.e., the reality of life after death.
In this parabolic manner the Qur'an points to the illusory concept of "time" as experienced by the human mind - a concept which has no bearing on the ultimate reality to be unfolded in the hereafter.
Cf. the last sentence of 6:47 and the corresponding note .