Answer by Bing 

The meaning of intertwined days in the Duality of Time Theory is that the original Days of events, in which Allah described Himself as being each Day upon some task, are intertwined with the circulated days in a specific manner1. This means that the inner real dimension of time, which is responsible for the creation and re-creation of the physical dimensions of space, is synchronized with the outer imaginary dimension of time, which is what we perceive as the flow of time. The theory suggests that this synchronization is achieved by dividing the day into 24 hours, and each hour corresponds to one of the original Days of events1. 

This concept is based on the Single Monad Model of the Cosmos, which is a metaphysical model that explains how multiplicity is dynamically emerging from absolute Oneness, and vice versa, at every instance of time2. The model is inspired by the works of Ibn al-Arabi, a prominent Muslim mystic and philosopher3. 

If you want to learn more about the intertwined days and the Duality of Time Theory, you can read the book by Mohamed Haj Yousef, who is the main proponent of this theory1. You can also visit his website for more information and resources. 

1: DUALITY OF TIME - 4.4.10.3 Intertwined Days 2: The Single Monad Model of the Cosmos - Mohamed Haj Yousef 3: Ibn al-Arabi - Wikipedia : The Duality of Time Theory 

Source(s) 

1. DUALITY OF TIME - 4.4.10.3 Intertwined Days 

2. SINGLE MONAD MODEL - 4.1. Demonstrating the Intertwined Days: 

3. The Single Monad Model of the Cosmos - Mohamed Haj Yousef