So I feel pretty fucking stupid.
Because I avoided Limsa like the plague as soon as was practicable, I never realized I was supposed to unlock the challenge log early. Just assumed it was something I hadn't reached yet when I saw it greyed out in my logs menu. Wish they'd have added a way to unlock it in the other cities too like they did with retainer shit.
Which means I missed out on all the Adventurer Squadron stuff this whole time.
Anyone know what the over/under on how long it'll likely take me to get my squad of retards up to 40 so I can move up a rank will be, since the deployments are timed at 18 hours?
I believe the Challenge Log is separate from the Squadron, though it's been a while. I think its only use is tied to new recruits.
Squadrons are done through your Grand Company and require you to hit a certain rank. Build up GC seals and turn them in for promotions and do your
Hunt Log for your Grand Company, as it requires you to complete that.
If you haven't unlocked Halatali, Sunken Temple of Qarn and (I think) Cutter's Cry, do so in Vesper Bay where the Scion HQ is. There's an NPC just outside with the quests. You'll need those for the Grand Company Hunt Logs.
Generally, do any quests that are the blue (+) ones as soon as they're available.
For leveling your squad, you have a few options.
Training exercises: these can raise stats or give XP and take about an hour to complete. These are refreshed daily IIRC. If you're playing for a chunk, do these. You can access them on the little board in your barracks room.
Field duties: these act like retainer ventures and last 12-18 hours IIRC.
Squadrons: These are tied to their actual level and are basically just you running instances with them. You can do these as long as you want, but they're tied to your squad's level, so you'd be starting off doing the beginner dungeons.
If you no life it, it doesn't take very long.