long-termly
durative
long
long game
make old bones
secular
enduring
abiding
imperishable
light year
at length
long-span
longue durée
inveterately
protracted
lifetime
hot minute
long-pending
for the ages
for the long haul
eon
with ages
until the cows freeze over
until the cows come home
yearslong
dog's age
longwhiles
long haul
lengthen
donkey's ears
donkey's years
indestructible
undestroyable
perdurable
durable
hyperpersist
longsomely
lock up
eternity
deep
tick past
overrun
permanent
eudemic
longevous
longirostrate
longstandingness
plurennial
longevously
macrobiotic