How I Met Your Mother/The Three Days Rule
From The TV IV
| The Three Days Rule | |
| Season 4, Episode 21 | |
| Airdate | April 27, 2009 |
| Production Number | 4ALH22 |
| Writer(s) | Greg Malins |
| Director(s) | Pamela Fryman |
| Download |   |
| Mosbius Designs | Right Place Right Time |
| How I Met Your Mother — Season Four | |
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The Three Days Rule is the twenty-first episode of the fourth season of How I Met Your Mother, and the eighty-fifth episode overall.
Starring: Josh Radnor (Ted Mosby), Jason Segel (Marshall Eriksen), Cobie Smulders (Robin Scherbatsky)
With: Neil Patrick Harris (Barney Stinson)
And: Alyson Hannigan (Lily Aldrin (credit only))
Guest Starring: Rebecca Budig (Holli), Kevin Michael Richardson (Stan)
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