Time is a way to simply measure the Nothings age. It is a simple way to measure our own age. But time when involved with creational magic is more complex.
The Nothing has built onto a part of its complexity, layers, dimensions, resources, and magics. Time however, when related to the Nothing, effects dimension structure. Think of it like layers of blankets, to create specifically "Adam" you have to lift up 3 blanket layers and search in the middle. Whereas to create "Eve" youd need to lift up 7 blankets and search a corner.
Creational magic has split pathways similar to a fork, and is based on timing created, and materials used.