The First Move

If you have progressed the 9.1 campaign on your main, alts will at this point be offered a skip into Korthia. I was curious what you're giving up with this skip and how much time it saves.

Going through the quests by yourself should take 2-3 hours.

This is what I picked up as quest rewards by not using the skip:

750 [currency=1813]
10 [item=186599]
1 Korthite Crystal
I didn't bother keeping track of gold, but probably ~1k

187 weapon
200 armor
207 armor

1750 Valarjar reputation (the Legion faction)
2850 Ve'nari reputation
1000 The Wild Hunt reputation
500 Court of Harvesters reputation
500 The Ascended reputation
500 The Undying Army reputation

Questline started at login in Oribos with 9.1. Maybe you have to complete the previous campaign before.
Part of Chains of Domination.
You can skip the first three chapters, if you've already done them with an other character by talking to Highlord Bolvar Fordragon instead of [npc=177136] at step 1.1

Chapter 1

1. 
   
2. The First Move - talk to [npc=177136] (cinematic)
   If you want to skip, talk to Highlord Bolvar Fordragon instead of [npc=177136] and tell him "I have heard this tale before.". You get Korthia Awaits, which sends you to Tal-Galan
3. 
   
4. A Gathering of Covenants
5. 
   
6. Voices of the Eternal - (cinematic)
7. 
   
8. The Battle of Ardenweald - S1: go to southern part of Oribos and click [npc=178291]
   S2: click the fae's [npc=178524] next to you
   S3: kill enemies and click objectives ([npc=177820], [npc=178747]) to fill the bar
   S4: go to marked area and attack [npc=177114]
   S5: mount [npc=177365]
   S6: use [spell=350749] against enemies
   S7: kill [npc=177159]
   S8: click 4 seeds, yellow dots on the map
   S9: click the two [npc=178440]s
   S10: kill enemies that are leaving the portals to fill the bar (cinematic)
9. 
   
10. Can't Turn Our Backs - talk to [npc=177460]
11. 
    
12. The Heart of Ardenweald - talk to [npc=178565]
13. 
    
14. Report to Oribos - return to Oribos
15. 
    

Questline took about 30 minutes, incl. cinematics.

Chapter 2

Spoiler

1. 
   
2. Opening the Maw - talk to [npc=159478]
3. 
   
4. Link to the Maw - jump into the maw and talk to [npc=162804]
5. 
   
6. Mysteries of the Maw - click [npc=177246] right behind, talk to [npc=177819] and follow her
7. 
   
8. Korthia, the City of Secrets - talk to her and go to the marked area. Watch dialogue, talk to [npc=180469] and follow him
9. 
   
10. Who is the Maw Walker? - start the test. You'll get [spell=353214]
11. 
    
12. Opening to Oribos - activate waystone and use it
13. 
    
14. Charge of the Covenants - click extra button [spell=353260] and enter the portal behind you
15. 
    
16. Surveying Secrets - talk to [npc=180523], [npc=180520], [npc=180525] and [npc=180521], they are also marked on your map.Kill enemies until you find [item=187439]
17. 
    
18. In Need of Assistance - complete quests nearby: Observational Records, Anima Reclamation, We Need a Healer - You!. Maybe they change, because they are marked as dailies.
19. 
    

Questline took about 40 minutes.

Chapter 3

Spoiler

1. 
   
2. A Show of Gratitude - go to [npc=178470]
3. 
   
4. Ease of Passage - talk to her and click [npc=178085]. Collect her bag and bring it to the teleporter. Talk to [npc=162804] in her Refuge
5. 
   
6. Grab Bag - click the transferral augmentor. Return and do it again
7. 
   
8. Hearing Aid - click extra button [spell=351849] and click 3 objectives at marked areas
9. 
   
10. Birds of a Feather - find [npc=177597]
11. 
    
12. The Caged Bird - kill [npc=178311], open cage
13. 
    
14. Claim the Sky - fly with [npc=177597] (cinematic)
15. 
    
16. A Hate-Hate Relationship - go to her and watch dialogue. Click extra button [spell=353828]
17. 
    
18. Fury Given Voice - talk to [npc=177732] and follow his instructions. Collect the horn
    The Chosen Few - walk to the other side and blow the horn of challenge. Defeat 3 [npc=178151]
19. 
    
20. Wrath of Odyn - talk to [npc=177726]
21. 
    
22. Mawsplaining - teleport back to Oribos or jump into the hole marked on the map. Return to [npc=162804] in the maw
23. 
    
24. Tears of the Damned - collect tears from the ground
    Anger Management - use [item=186094] on [npc=178572]. Don't kill them
25. 
    
26. Focusing the Eye - go to marked area and click extra button [spell=354133]. Defeat [npc=178863]: walk over your shadows and the spear. Throw [spell=354048] to let smaller eyes spawn. Kill them
27. 
    
28. Good News, Everyone! - fly with [npc=178950] and talk to [npc=177228]
29. 
    

Questline took about 35 minutes.

Continues at renown 44.

Just an FYI, Bolvar continues to offer the skip option if you continue on and then change your mind. I do not know for how long he has the option, but the skip is still offered after doing The Battle of Ardenweald, which is great for those alts needing a 187 weapon, or collectors who want all the unique weapon mogs. Credit to @Hyrcyne for pointing this out on another page.