Need to View Duration of Flight Plan

My use of Mission Planner is very specific and I need to be able to tell the flight duration of the planned flight before taking off.

The only place I have been able to tell the duration of the flight is when i create a grid and look into the advanced options. However, my flight patterns are back and forth on the same path, so the grid format doesn’t work.

Please let me know if there is somewhere that I can view flight duration or somehow add it to the software.

Thanks,

Lucas