Do you have sample data showing the "intermediate values" "step by step"?

I'm having a hard time to understand differences between adjecent values (adjecent in time), especially, since there are duplicate time values...

A few sample data would really help.

My approach most probably will be a CTE with ROW_NUMBER and a "self reference" to this cte with an offset of +1 to get the two values required for the "adjecent values differences".