I've been spoiled before by several 'immediate best friends' intros, so I'm out of touch with the reality of a typical one. They seem to be taking turns being the boss, yesterday the older one was doing the chasing and the younger was dramatically verbal about it and now the younger one is the chaser.
- I dissent.
I guess the short answer is...it takes as long as it takes. Sometimes guinea pigs will hit it off right away; other times it can take weeks or months. I'd continue to let them work it out until or unless things get ugly.
When did you put houses back in? I've got a chube in the cage and towels draped over the corners of the C&C so they have canopied places to lounge.
Make sure that this enclosure is also neutral in the meaning that neither pig thinks it’s theirs so they have nothing to fight over. Monitor them for a while, and when you are comfortable, put them back in the cage together, but this time re arrange the things in there. If you haven’t already, add a second water bottle / bowl.
You also should keep an eye on them for the next couple of days to make sure that this doesn’t happen again. Good luck!
- I dissent.
It sounds like you're doing everything right. These may be two guys that will never "bond" but may eventually learn to tolerate each other. I've had plenty of those, too.