Smarts - Telan's previous posts were an attack thread against the Onyxian Commonwealth. The "lightning" attacks were bent on sowing confusion with the whatever forces remained of said Commonwealth prior to the heavy fleets crossing the borders. Also, Kraken's Empire at War is also takes place during this time isolating the Cren Alliance from the rest of the Coalition.
None of the Commonwealth was annexed during this period because the Telan did not have the forces to actually hold any planetary territory (his forces were simply to move throughout the CW sowing destruction where they went) "Cut, Slash, Run" as it were. So when he says, 5 Days after Annexation, he means, 5 days after Onyx was ceded to the Empire by Coalition. The 2 weeks started the day after the ceding of the territory.
At the end of the meeting from On Bended Knee, Kaine remarks that Telan should have all planets with some sort of fleet presence within "a few days". That would have been a few days into the evac.
Telan's thread says his fleet finally arrived at Onyx on the 5th day. I attribute this difference to Kaine's theoretical expectation to Telan's actual reality "in the field".
Either way, the evac time period is still moving forward.
The message Telan sent to Onyx upon his arrival. To be sure, this would be the same message he sends to every CW world he visits. It does not have to mean it STARTS then. Reminder to those evacuating that their total amount time allotted to them was 2 weeks (in case there were loitering about thinking about mischief).
In any event, IC if your people want to think the 2 weeks start at Telan's transmission to the planet Onyx (as opposed to any other world he had come from and transmitted his message too), they are mistaken and will be surprised when the Empire declares the time up when they think they have 5 more days.
Beff: You know you're the best.