overlong
long as one's arm
dragging
overkeep
overprotracted
superlong
overfast
month of Sundays
blue moon
drag on
forever
crow's age
far
age
coon's age
donkey's
light year
grip
ages
years
overgoaded
TL;NR
longwhiles
longish
ultralong
outreach
overminute
overlengthen
overpromptly
overquickly
overhurriedly
overrun
overdaintily
overstrenuously
overswiftly
overbusy
inveterately
at length
outstay
overstay
longsome
overlate
until the cows come home
until the cows freeze over
a day after the fair
dolicho-
overhastily
eon
aeon
overhasty
the genie's out of the bottle
macro-
overfar
with ages
overquick
overslow
overminuteness
overlive
underlengthen
overdrift
go all around the Wrekin
abiding
overpursue
imperishable
interminable
overintimately
endless
forever and a day
eternal
enduring
eternity
lifetime
hot minute
overloose
long
extralong
overreadily
overclosely
lengthen
sesquipedalian
overnarrowly
period
stretch
oversoak
macrobiosis
in haste
long-span
drag out
overtill
overhard