If anyone has a solid account of any unverified respawn times, would you be a dear and post? I'll edit them in.
Names in bold means the skin is unique to that particular rare, an asterisk means they're exotic.
A
Aotona: 4-10 hours?
Araga: 21-32 hours
Arash-ethis: 5-8 hours
Arcturis*: 10-12 hours (Varies wildly)
Azzere the Skyblade: 4-6 hours
B
Barnabus: 21-32 hours
Big Samras: 10.5-16 hours
Bjarn: 5-10 minutes
Broken Tooth: ??
C
Chatter: 4-6 hours
Clack the Reaver: 10.5-16 hours
Clutchmother Zavas*: ??
Cranky Benj: 32-48 hours
Creepthess: 8.5-12.5 hours
Crusty: ??
D
Darkmist Widow: 5-8 hours
Dart: 5-8 hours
Death Flayer: 20-30 minutes
Death Howl: 21-32 hours
Deathmaw: 5-8 hours
Dishu: 1.5-2.5 hours
Duskstalker: 20-30 minutes
E
The Evalcharr*: 32-48 hours
G
Giggler: 10.5-16 hours
Gondria*: 6-10 hours
Gorefang: 1.5-2.5 hours
Goretooth: ??
Greater Firebird: ??
Gretheer: 21-32 hours
Grubthor*: 10.5-16 hours
Grunter: 32-48 hours
H
Haarka the Ravenous*: ??
Hayoc: ??
Humar the Pridelord: 8-12 hours
I
Ironback: 10.5-16 hours
K
King Krush*: 4-10 hours?
King Mosh*: 32-48 hours?
Krellack: 10.5-16 hours
Krethis Shadowspinner: 1.5-2.5 hours
Kurmokk: 32-48 hours
L
Lapress*: 32-48 hours
Large Loch Crocolisk: ??
Leech Widow: 4-6 hours
Lord Condar: 4-6 hours
Loque'nahak*: 4-10 hours?
Lupos: 4-6 hours
M
Mazzranache: 20-30 minutes
Mist Howler: 8.5-12.5 hours
Mongress: 32-48 hours
Mother Fang: 5-10 minutes
Murderous Blisterpaw: ??
N
Naraxis: 5-8 hours
Nuramoc*: ??
O
Old Cliff Jumper: 10.5-16 hours
Old Grizzlegut: 32-48 hours
Old Vicejaw: 5-10 minutes
Olm the Wise: 21-32 hours
Oozeworm*: 32-48 hours
R
The Rake: 20-30 minutes
Rak'Shiri: 10.5-16 hours
Ravage: 10.5-16 hours
Razormaw Matriarch: 5-8 hours
The Razza*: 4-8 hours
Rekk'tilac: 21-32 hours
Ressan the Needler: 20-30 minutes
Ripscale: 10.5-16 hours
S
Scalebeard: 5-8 hours
Sewer Beast: ??
Shadowclaw: 1.5-2.5 hours
Shanda the Spinner: 4-6 hours
Silithid Ravager*: ??
Skoll*: 10-12 hours
Snarler: 5-8 hours
Snort the Heckler: 2-3 hours
Soriid the Devourer: ??
Spiteflayer: 10.5-16 hours
Sri'skulk: 20-30 minutes
Strider Clutchmother: 5-10 minutes
T
Takk the Leaper: 4-6 hours
Terror Spinner: ??
Timber: 5-10 minutes
U
Uhk'loc: 6-8 hours
Ursol'lok: 10.5-16 hours
V
Vile Sting: ??
Vultros: 21-32 hours
Z
Zaricotl: 5-8 hours