How to calculate the average cycle time

Hi -

I was wondering if there is an easy way to calculate the average cycle time when dates and times are present.
I have a spreadsheet with approximately 40k rows and require an average cycle time per truck.
Attached is an example spreadsheet.

Dummy Spreadsheet.xlsx

Any assistance will be greatly appreciated otherwise i'll be doing it manually

=AVERAGEIF($C$2:$C$69,F3,$B$2:$B$69) in G3 and copy down

Hi,
May be a solution with pivot table
Hope this helps
Best regards