What is the supplication that is recited 100 times in the last third of the night for 3 days, and its response is immediate?

The aforementioned supplication has not been attributed to Zain al-Abidin or anyone else, nor has its legitimacy been established. Specifying it for the last third of the night falls under the definition of an additive innovation (bid'ah idafiyyah). A Muslim should resort to Allah and increase in supplication and humble entreaty, especially during times when supplications are likely to be answered, such as the last third of the night.