Even though I only just bottled my first beer, I had tremendous success with clarity using a long primary and secondary. A quirk of bad scheduling left me with a 2 week primary fermentation, and nearly 3 weeks in my secondary. When I bottled yesterday, the beer was crystal-clear at 68degF.
6.5 gal Glass Primary: Air, waiting to be thoroughly cleaned
5.0 gal Glass Secondary 1: Air, waiting to be thoroughly cleaned
5.0 gal Glass Secondary 2: Air, cleaned
5.0 gal Glass Secondary 3: Air, cleaned
On Deck: Fat Tire Clone
Bottled, waiting: Nada
Bottled, ready: Black Forest Stout, Vanilla Porter