Time data and Average time.

It's hard to explain what is my problem. I'm going to try with a small example.

I have a cell with a lot of examples and 8 variables.

The first column represents the name of a Machine. The second column represents the reference number of an Element. The column number 3, represent how many elements manufacture the Machine. Columns number 4 and 5, represents the start time and the finish time of the process to manufacture the elements. Columns number 6 and 7, represents the start time and the finish time to prepare the Machine.

There are repeated values for the first two columns (Machine and Element).

I want to calculate the average time per unit of element of each element in each Machine and i don't know if it's possible to do that with MatLab.

Here is an example of the type of the data: