I think I found a solution to the issue of the length of Phineas and Ferb’s summer.
So we all know that Milo Murphy’s Law starts on the day immediately after Phineas and Ferb ends. We also know that MML takes place in either 2016 or 2017 because of Zack’s retelling of his boy band back story, where he says ‘It was the year 2016…’. Therefore, this would also mean that every single episode of PnF (bar holiday specials, etc) also takes place in 2016 or 2017.
Which can’t happen, because that would mean over the course of three months, everyone went from using flip phones to using smart phones and calling CDs antiques. You could argue that due to PnF’s incredible and advanced technology, such a rapid increase compared to our world would make sense. However, many characters go on to express how long the summer feels; far more than 104 days and seemingly going on for even years (and yes I know these are just fourth wall jokes but listen. I can do what I want).
So what I’m suggesting is that the reason PnF’s summer went on for eight years was at the fault of Cavendish and Dakota.
So far we’re not sure why they’re hated by the agency so much, but it wouldn’t be hard to imagine that it was due to some disastrous mistake that could’ve cost them their secrecy and possibly endangered lives. What if they messed with some sort of time altering device that they shouldn’t have and then fumbled it up in some way that caused all of Danville to slow their time relative to the rest of the world? The agency would try to cover it up as best they could, convincing people stuck in time that ‘gosh, this summer just seems to drag on, doesn’t it?’, at the very best leaving a few head scratches and mild confusion. Cavendish and Dakota would be shunned and hated by all other agents for causing such a devastating mistake; pushed to the side and given the most inconsequential task possible, so there was absolutely no chance of them being able to screw up time again.
Idk this may have all been said before by others but I don’t frequent the MML tag enough to have noticed. In any case I’m not entirely sure how well this all holds up, I was just trying to make sense of this inconsistency without just saying 'don’t think about it.’ It’s almost 1am and I need to get up at six tomorrow. I’m going to go to sleep.