Number of cells between start and end point based on flow direction

Hi all!

I am looking for a way to calculate the following.
I have a raster file with my so-called starting points.
I want to calculate the number of cells or the area of the cells between the starting point and the next starting point (the so called end-point). Making a subset of the cells would also be fine.
The points can be linked to each other using the flow direction (ddm30 raster file).

Anyone who has suggestions how to start?

Thank you!

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