Help Using Slicer to Calculate Difference Between Two Hours

Hi,

We are using the Slicer to handle a view of dashborad:

Image1

For Example we have:

Moment 1: 7 - 8 : Difference 1 Hour - We need to use this value for other calculations

Moment 2: 10 - 14 : Difference 4 Hour - We need to use this value for other calculations

Can someone explain me how can I dinamically get this value since user change the range to visualize different data.

Kind regards,