long as one's arm
superlong
far
dolicho-
macro-
blue moon
grip
age
donkey's
ages
longish
coon's age
years
light year
crow's age
ultralong
overlong
dog's age
dragging
forever
long
longwhiles
inveterately
with ages
at length
mecocephalic
hyperextended
long ass
eon
lifetime
hot minute
durable
enduring
indestructible
undestroyable
perdurable
imperishable
abiding
lengthen
sesquipedalian
until the cows come home
until the cows freeze over
endless
interminable
eternal
macrobiotic
stretch
period
sesquipedalianism
month of Sundays