Here's another example of a test return time
Gleison Tibau, got notified of his failure for EPO 4 weeks after his Fight Night 77 match
He got Notified for his IN-Competition test failure 3 weeks after that. If the testing is taking longer than necessary, why did Tibau's in-competition test take over a month to return? This is only the first example I've dug up of testing return time, if they were just picking times based on the importance of the fight/fighter then they would just notify Tibau ASAP after the fight.
The testing occurs until it hits a flag, then it is verified and when so released to the fighter/UFC. That's how the testing works. I seriously doubt (unless Nowitzy really wants to hang himself with the UFC here) that they are picking and choosing which fighters to notify when.