lifetime
eon
hot minute
long-span
until the cows come home
until the cows freeze over
years
age
long time
eternity
aeon
donkey's years
donkey's ears
inveterately
at length
long
imperishable
enduring
abiding
dog's age
donkey's
blue moon
ages
grip
forever and a day
crow's age
light year
with ages
coon's age
interval
longwhiles
longue durée
long haul
month of Sundays
eudemic
in the long term
forever
in the long run
prolongedly
period
long run
stretch
time out of mind
long ass
longish
for the long haul
lengthen
overtime
durative
long-pending
drawn-out
o'er
over
yonks
overlong
all the while
cycle
at last
protracted
longstandingness
no end
long as one's arm
for long
minute
superlong
yoinks
perdurable
any more
durable
undestroyable
take time
indestructible
longitudinal
macrobiotic
Rome wasn't built in a day
long-range
day and age
overprotracted
longsomely
time-consumingly
durate
long-termly
chronophagous
longtime
mecocephalic
lengthily
go all around the Wrekin
some time
schlep
secular
prolong