Tafsir of Al-Mu'minoon 23:54

فذرهم في غمرتهم

So, leave them in their error, meaning their misguidance,

حتى حين

for a time. means, until the appointed time of their destruction comes. This is like the Ayah:

فمهل الكفرين أمهلهم رويدا

So give a respite to the disbelievers; deal gently with them for a while. (86:17) And Allah says:

ذرهم يٲكلوا ويتمتعوا ويلههم اﻻمل فسوف يعلمون

Leave them to eat and enjoy, and let them be preoccupied with (false) hope. They will come to know! (15:3)

أيحسبون أنما نمدهم به من مال وبنين