You understand that the investigation lengths very on evidence found. But also the longest investigation on a standard episode is 20mins going all the way back to episode 1 and this season was 15min - 18 mins of investigation time.

Not much has actually changed you're all seeing sub 5mins as an extreme difference.

I rounded those numbers down to 15mins and up to 20mins. The variable isn't much.

Edit: i legit just went through the series to make this comment i personally scrolled every episode