I'll second Student Prince, Illogical, and Retrograde and add a few I've relistened to more than once...
Bandom klb, Forever, Now (my first bandom fic which caused my headlong fall. Very AU and kid!fic, but I tend to dislike kids, and this story just tore my heart--My Chemical Romance mostly). Really great recordings of the sequels by argentumlupine HERE. Both readers are among my favorites!) ~9h
If you want really long and really AU, I adore reena jenkins's Screaming Down the Starlit Sky It's basically a music video AU with every bandom character in there. The AU world is a complex vampire universe that feels a bit like Vampire The Masquerade but is basically drawn from this one Fallout Boy video/. And I knew NONE of that when I started reading it and still enjoyed the heck out of it, basically as funky OCs. And Reena's really great here! ~15 h.
Hockey isweedan Enough to Crush Your Veins (my first Hockey fic...there seems to be a pattern here :) It's a road not taken AU, again with kid, but again totally tolaerable, except it's definitely very cute! But in comfort podfic I like that kinda stuff. ~9h
rhea314 If Heaven's Hypothetical (another of the really early ones I listened to, same pairing as the other, and I really don't tend to read them, but both stories hit weird kinks of mine clearly. This is AU but they find each other and also road not taken, one isn't in their profession) ~7h
MCU Liannabob's Refrain (mostly gen with a little Tony/Pepper, action focused) ~ 1-h
OK, so this clearly shows my own tendencies in long podfic--I don't like experimental or complicated in my long stuff. I want either heavy H/C or weird long drawn out UST with happy ending. I like Clint/Coulson, so I'm reccing Liannebob's Through a Glass Darkly (heavy angst!!! mind control) ~6h or Arsenic's As Is (sleve!Clint...) !6h
DS Dira Sudis's Hawks and Hands is an older recording and even older story, but I just relistened, and it still holds up. Fraser and Ray as hockey players with lots of canon tie ins... ~26h
GK Chemm80's Don't You Shake Alone (Yeah, I seem to listen to nothing but kid fic--here baby--but it's really about PTSD and Brad trying to help Nate and negotiating their relationship, all beautifully read by Chemm80) ~ 7h
XM If you can handle various readers and like XM, you might enjoy Yahtzee's Winter of Banked Fires It's XMFC and X3 compliant and my personal head canon... ~7h
SPN I love worldbuilding, and this story has some major one. It's Dean/Sam, but they kinda don't know one another? Also: Angels!!! Crinklysolution, Kant's Dove ~4h
Likewise, Tenoko's Convenient Husbands creates a different world with hunters and a more apoca world. Dean/Cas. ~4h
Oh man, I feel like I can go on and on, but not knowing which fandoms or tropes/kins/squicks you prefer makes is harder... Anyway, hope you'll find something for your trip!!!
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Bandom klb, Forever, Now (my first bandom fic which caused my headlong fall. Very AU and kid!fic, but I tend to dislike kids, and this story just tore my heart--My Chemical Romance mostly). Really great recordings of the sequels by argentumlupine HERE. Both readers are among my favorites!) ~9h
If you want really long and really AU, I adore reena jenkins's Screaming Down the Starlit Sky It's basically a music video AU with every bandom character in there. The AU world is a complex vampire universe that feels a bit like Vampire The Masquerade but is basically drawn from this one Fallout Boy video/. And I knew NONE of that when I started reading it and still enjoyed the heck out of it, basically as funky OCs. And Reena's really great here! ~15 h.
Hockey isweedan Enough to Crush Your Veins (my first Hockey fic...there seems to be a pattern here :) It's a road not taken AU, again with kid, but again totally tolaerable, except it's definitely very cute! But in comfort podfic I like that kinda stuff. ~9h
rhea314 If Heaven's Hypothetical (another of the really early ones I listened to, same pairing as the other, and I really don't tend to read them, but both stories hit weird kinks of mine clearly. This is AU but they find each other and also road not taken, one isn't in their profession) ~7h
MCU Liannabob's Refrain (mostly gen with a little Tony/Pepper, action focused) ~ 1-h
OK, so this clearly shows my own tendencies in long podfic--I don't like experimental or complicated in my long stuff. I want either heavy H/C or weird long drawn out UST with happy ending. I like Clint/Coulson, so I'm reccing Liannebob's Through a Glass Darkly (heavy angst!!! mind control) ~6h or Arsenic's As Is (sleve!Clint...) !6h
And I've recently discovered my liking for Mary Sue!Darcy with all the guys, including She Blinded Me With Political Science (Darcy/Bruce, ~6h) and Five Things Darcy Loves Working for SHIELD (Darcy/Steve, ~6h), both gorgeously voiced by Litra, and Kalakirya's you need a rock not a rolling stone (Darcy/Clint, 4h)
DS Dira Sudis's Hawks and Hands is an older recording and even older story, but I just relistened, and it still holds up. Fraser and Ray as hockey players with lots of canon tie ins... ~26h
GK Chemm80's Don't You Shake Alone (Yeah, I seem to listen to nothing but kid fic--here baby--but it's really about PTSD and Brad trying to help Nate and negotiating their relationship, all beautifully read by Chemm80) ~ 7h
XM If you can handle various readers and like XM, you might enjoy Yahtzee's Winter of Banked Fires It's XMFC and X3 compliant and my personal head canon... ~7h
SPN I love worldbuilding, and this story has some major one. It's Dean/Sam, but they kinda don't know one another? Also: Angels!!! Crinklysolution, Kant's Dove ~4h
Likewise, Tenoko's Convenient Husbands creates a different world with hunters and a more apoca world. Dean/Cas. ~4h
[ETA: I forgot Teen Wolf!!!
Mothlight's <"http://archiveofourown.org/works/912147">Play It Again and Misfire (both time travel and AU) ~10h; ~4h
Chemm80 World That Turn on Their Own (future fic) ~6h]
Oh man, I feel like I can go on and on, but not knowing which fandoms or tropes/kins/squicks you prefer makes is harder... Anyway, hope you'll find something for your trip!!!