Assalamoualaikoum If the duah contains only Allah's name, I've in mind a particular hadith which can help you. Abu Huraira (ra) reported that the Messenger of Allah (saw) said, "Allah has ninety-nine names, one hundred less one. Whoever 'ahsaha'[enumerates them, believes in them, ponders their meanings, worships Allah by them and supplicates with them, and acts by them according to one's belief in them] will enter Paradise and Allah is Witr (one) and loves 'the Witr' (i.e., odd numbers) (Recorded by al-Bukhari and Muslim) Hope it helps And Allah Ta'ala knows best Ayaz