Perin will go behind Swithun and Surina for normal marching. Blaith can range ahead of the group. If anything needs scouting Perin will happily sneak forward to check it out. While he's happy to scout ahead, I don't see him as having the personality to push back against Swithun's enthusiasm.
Not sure this matters all that much but Perin's ritual is only 8 hours.
In any case, it was noon. you definitely took a long rest (or you take rests in shifts, whatever). So now it's 8pm. Not going to head toward the swamp at 8pm. So you camp in the camp overnight and leave in the morning. I guess that means Perin has time to rest and perform the 8 hour ritual before dawn the next day. I also assume you leave at dawn. So, I will post in the IC how the party departs the camp and heads for the lizardfolk in the swamp. The swamp is 3-4 days away at least (I think, I have to check my own maps).
So it's summer so I know it's sometimes hard to post. Please sound off that you are around or planning to not be around or whatever. I'll be advancing the story tomorrow sometime to where you are without scouting distance of the next location of interest.