Is it sufficient for a person to weep once in their life out of fear of Allah to be among those whom the Fire will not touch, based on the noble Hadith: "Two eyes will not be touched by the Fire: an eye that wept out of fear of Allah"?

The apparent meaning of the Hadith is that whoever weeps out of fear of Allah, even once, or spends a night guarding in the path of Allah, even for one night, will not be touched by the Fire. There is no mention of a specific number for this, for Allah's mercy and bounty are immense.