Translation of the verse 29 from Surah Saba’ : Number of verses 54 - - page 431 - Part 22.
And they say: "When is this promise (i.e. the Day of Resurrection will be fulfilled) if you are truthful?"
And they say, "When is this promise, if you should be truthful?"
(34:29) They ask you: 'When will this promise (of Resurrection) be fulfilled, if what you say is true?' *48
*48) That is, "When will the time come about which you say: `Our Lord will gather u: together, then He will judge between us rightly?' We have been denying you persistently and opposing you openly for so long. Why is not then the judgement being passed against us ?"
Source : Saba’ Verse 29: And they say, "When is this promise, if you should be truthful?"