How long should I wait for a letter after completing Innocence Lost

I have edited .ini files, used the console, and played in Steam's offline mode. I have unlocked one achievement since reconnecting Steam to online mode.

Editing .ini files will not preclude obtaining achievements.

Having completed the "Innocence Lost" quest, I immediately fast traveled to my house in Whiterun and slept for 1 hour, the kidnapping took place straight away, there was no delay.

It has been noted on the wiki that:

If the courier doesn't appear after waiting a few days, sleep in a bed for at least 8 hours and the quest will continue.

• Sometimes this can take several days, even with sleeping.
• If the courier still does not appear, try fast traveling to a different hold and waiting.
• Sleeping for at least 8 hours is not necessary. 5 hours continued the quest. (PC) 1 hour continued the quest. (Xbox 360) 1 hour worked (PS3)

Just keep wandering around a different town and waiting until the courier arrives, it's been suggested this can take many days in game.