That's what most people want to know. I have some info in that regard
[Fri May 17 08:56:54 2013] You have slain Dread!
and then
[Mon May 20 05:36:09 2013] You have slain Dread!
[Fri May 24 11:02:32 2013] You have slain Fright!
and then
[Mon May 27 06:43:46 2013] You have slain Fright!
So these Golems can spawn far short of 72 hours. My experience is showing they can spawn as soon as 67-1/2 hours
and just for reference :
[Mon May 20 05:35:43 2013] Dread begins to cast a spell.
[Mon May 20 05:35:43 2013] You have taken 65000 points of damage.
[Mon May 20 05:35:43 2013] Dread shouts 'Yyvo!'
a 100k nuke lessened by max spell shield ( 100 - 35).


Amulet of Necropotence
Ball of Everliving Golem
Blood Fire
Bone Razor
Bone-Clasped Girdle
Crimson Robe of Alendine
Darkwood Trunk
DawnFire, Morning Star of Light
Lyssa`s Darkwood Piccolo
Monsoon, Sword of the Swiftwind
Puppet Strings
Shield of Rainbow Hues
Slime Blood of Cazic Thule
Soul Leech, Dark Sword of Blood
Spined Dragon Claws
Staff of the Earthcrafter
Withered Totem of Widdershins