I am sorry a translation of the same would render the song useless; the lyrics use very Indian/Urdu/Subcontinent imageries. I cannot translate the song as 'Till when did the candle/lamp burn...'; it would be a travesty. For the non-Hindi readers, let me just mention the song is a question from a man who tries to recall how and when his sorrow-soaked night ended in his intoxication. He reminisces that he had all the loved ones besides him at one point of time, but which of them betrayed him is unknown to him. Lost in the worldly pursuits, his mind is so clouded, he cannot even recall his beloved's address now. In any case, this pain-lashed night had everything romantic (the wine, the clouds), except her, hence he shudders at the thought of remembering how those unbearable moments would have passed; in the end, he feels that he has more or less lived his life-whether the life treated him fair or foul, he neither remembers, nor he cares.