I just bottled a porter which had been in the fermenter for almost a month. I allowed myself a taste un-carbonated, and while I don't want to count my chickens before they've hatched, I'm very excited for this one.
On Tuesday, I'm going to be taking a 2-3 hour motorcycle ride to meet up with my sisters for Thanksgiving. I would love to bring a couple of bottles with me. I anticipate they should be ready for a first taste around the end of my stay, and if I think they need more time to improve I would leave them behind to be enjoyed in a few weeks.
The question is, do I risk doing any harm by carrying them for a couple of hours in my saddlebags? The suspension on my bike is not fantastic, so I am sure that they will be thoroughly shaken throughout the ride. By this point, the beer will have been bottled for about 2.5 days.
The only discussion I have seen of agitating beer during bottle conditioning is this question. There, everyone seems to suggest that the OP doesn't need to shake their bottles, but it's not clear whether its just unnecessary or actually harmful.
Edit in response to Henry Talyor's answer below: The beer is in big glass bottles with ample head space. Yeast is white labs liquid Australian Ale, harvested from a previous batch. Estimated ABV is just over 5%. So, pretty much average all around.
I'll note also that I've travelled on my motorcycle with (finished) beer before and never had an issue beyond bottles foaming over if not left to sit. So, my concern is not so much that I'll break the bottles as that I'll disrupt the yeast's work by shaking too much.