From Zerger:

Hi,

According to the rule, the timer starts with clicking on "(re)start campaign" and stops when "campaign complete" is displayed"

Although you alt-tab at the end of the run, I validate your run with a total duration of 8m54s.

Congratulations!

I complete the main campaign on easy with Weevil.

I'm not especially lucky and beat it again a few hours later. I'll return to this if there are large jumps, but i want to document both here.