Xbox Scenario Timings!

Hi.I have just completed 'Shed life' from the new wagon pack on WCML south and really enjoyed it.Very busy,plenty of chasing yellows.My only grip is that the Scenario is timed at 60 minutes.Now I didn't really do much wrong and timed in at 1hr 46 minutes!!!...who the heck tests these things!

 

There is a few scenarios like I done on harlem line I think said it would take 45mins took me 1hr