How many hours, maybe 130 hours? When you say a few days, it sounds like 3-6 hours, but one dungeon can take atleast an hour. What's this Easter Egg?

Here's my text file with info from when I used to play this game...
---
Code:
The Elder Scrolls IV: Oblivion

Main Quest

Exploring the world
Defeating random dungeons
Leveling up

Sidequests
Guild/Faction
Arena

Knights of the Nine
The Shivering Isles

Locations visited:
Heartlands:
33. Imperial City Sewers N.E. Exit	High
36. Vilverin				High
37. Sideways Cave			High
31. Imperial City Sewers S.E. Exit	Low
29. Fatback Cave			High
08. Dzonot Cave				High
12. Sinkhole Cave			High
22. Imperial City Sewers N. Exit	Low
13. Chestnut Handy Stables		High
14. Imperial City Talos Plaza		Medium
	(5, 4, 3, 9, 10, 11, 12, 14, 19, 17, 16
	15, 21, 20, 18, 13, 27, 28, 26, 29)
21. Imperial City Elven Gardens		Medium
	(9, 7, 1, 3, 4, 5, 6, 8, 10, 16, 15, 14, 13, 12, 11
	19, 20, 21, 22, 27, 26, 25, 24, 23)
23. Imperial City Market District	Medium
	(1, 26, 24, 23, 22, 21, 18, 17(!), 12, 11, 8, 6, 5, 4
	7, 9, 19, 20, 25, 16, 13, 10, 3)
24. Imperial City Arena District	Medium
	(2, 8, 4, 5)
25. Imperial City Arboretum		Medium
	(7, 2, 5)
19, Imperial City Temple District	Medium
	(

---
Wayshrines...
Julianos: NW of Imp. City(Not activated, need fame)
Runestones...
Hestra: NW section of Imp. City island

Locations visited:
Imperial Prison Sewer			High
Imperial Prison Sewer North Exit	Low(need Hard Lockpicking skill)
...Passed by Imperial City Locations...
Weye					High
Wawnet Inn				High
Fanacasecul				High
Fort Ash				High
Odil Farm				High
Weynon Priory				High
...Passed by Chorrol city locations...
Ceyatatar				Medium(Need Average Lockpicking skill)
Greenmead Cave				Medium(Path blocked)
Grayrock Cave				Low
Derelict Mine				Low
Bloodcrust Cavern			Low
...Passed by Skingrad city locations...
Silorn					Low
Fyrelight Cave				Low
Ra'sava Camp				High
Miscarcand				Low
Dasek Moor				Low
Belletor's Folly			Low
Plane of Oblivion			Medium(Done?)
Kvatch					Medium(Progress blocked)
Gottshaw Inn				Low
Wildeye Stables				High
...passed by Bruma city locations
Dragonclaw Rock				High?
Sercen					Low
Roxey Inn				Low
Sideways Cave				Low
Vilverin				Low
---

I can't remember completely what the file means. The list on the bottom shows some locations and low/medium/high means how much I completed of it I think. In the middle part of the file the #'s mean locations I need to visit still, using the numbers from the strategy guide for the specific locations. Notice the first part of the file, it shows what you do in the game...

The Elder Scrolls IV: Oblivion

Main Quest

Exploring the world
Defeating random dungeons
Leveling up

Sidequests
Guild/Faction
Arena

Knights of the Nine
The Shivering Isles

...What if I skipped all the random dungeons but did everything else? How long would finishing Oblivion, Knights of the Nine, and The Shivering Isles take, 300 hours? ?!