Not the person you asked but pretty sure you can go faster than even 12 minutes for Sohm Ahl. When I get home I guess I can try, but there were other dungeons I know the time of that were like 'literally impossible' to go faster in a DF but you could finish them in HALF the time with your squadron. Really fast and easy exp. Certain dungeons are your target though because boss mechanics can make it less enjoyable experience with squadrons.
Trick was to get everyone on offensive (at max rank), and make sure you have the right jobs as not all jobs were created equal. I haven't tried them all myself but I've heard really bad things about some jobs (classes..). I have Arcanist and Archers which both seem to do well, the range is nice as you can keep things going and not have the entire show come to a halt because they AI decided to derp. You will need to modify your strategy a little based on which job you are but your max rank team is pretty hearty so let them go take a lot of the heat.
Like.. besides boss mechanics that's the trick lol. Just max rank offensive and melt everything.
I mean you'll do so much damage I don't even attack the mountain slime (second boss mechanic that wipes your party).. just kill the boss before the thing even can finish.
Squadrons are WAY stronger, in perspective (obviously they can't do the same content), to Trusts. It makes trusts feel kind of sad lol. I love the dialog and that they have a bit more smarter sense to them, but I feel like if my squadron and trust members got into a fight my squadron would delete the trust. XD. I do hope there is a more exciting and friendly progression system for trusts in the future to help with that.
Most annoying aspect of squadrons is how little they care and cannot easily handle certain mechanics, like if you don't have a good aoe skill while fighting that goblin tank contraption when it does the bomb spread.. Ha Ha Ha - good luck.