FourtNight 

14 days; 2 weeks.

It has been a FourtNight since we last spoke, can we talk again soon?

FourtNight by 📊 March 9, 2019

Fortnight 

2 weeks. It is 14 days, which is 2 weeks, which is 1 fortnight. Its not the game, FortNite, which is spelled differently, its just 2 weeks.

Mike: I just played FortNite for a fortnight!
Liam: Wait, what?
Mike: I played FortNite for 2 weeks, which is a fortnight, its kind of confusing now that FortNites popular.
Liam: So you played FortNite 14 days straight?
Mike: Yep, for a fortnight.

Fortnight by TheStrangerWhoKnows November 18, 2018

Fartnight 

The agonizingly long period that an especially pungent fart hangs in the air after being released.

"Dude after you ripped that one, it smelled like ass for a fartnight!"

Fartnight by ToxSick1333 December 9, 2012

forknight 

I. One of the many examples of illiteracy of the character, Charlie Kelly, from It's Always Sunny in Philadelphia. Introduced while bantering with the lawyer during the episode "Paddy's Pub: Home of the Original Kitten Mittons", this educated pseudo-noun is the perfect interjection into any conversation where some period of time has passed/will have passed.

II. Specifically, a forknight is a period of time that the user defines that makes the plural usage of forknight redundant and thus, by it's very definition, perfectly acceptable in an illiterate sense.

I.

Charlie: "Now mind you that here-to-for document had dry ink on it for at least many forknights."
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II. The period of time covered below is equivalent, dependent on the time in a forknight.

"The OJ Simpson murder trial lasted several forknights before a verdict was reached."

"The OJ Simpson murder trial lasted a forknight before a verdict was reached."

forknight by Mr. Magoo vol. 2 April 11, 2012

International taco fortnight 

International taco fortnight originated around 2012 in the Monterey Bay Area of California and is an annual festive event to celebrate tacos and Mexican cuisine in general, lasting one fortnight (or longer if desired). One is encouraged, but not required, to consume tacos on a daily basis for the duration of this event. Documenting your activities relating to this event on video or otherwise is encouraged, however frowned upon by some as "yet another image of food". The exact date of this event fluctuates and typically is announced a few weeks ahead of time.

I just ate three whole cheese tacos to celebrate international taco fortnight and now I feel sick.

International taco fortnight by Xantipe January 27, 2018

Fortnight 

A series of two weeks.

The guards watched over the castle for fortnight.

Fortnight by PerkStealer52 June 3, 2018

fortnight 

Fortnight is a word the English say instead of saying Two weeks.

"I am going away for a fortnight"

fortnight by Linsley August 11, 2004