durative
long-pending
durable
abiding
enduring
perdurable
imperishable
long-termly
indestructible
undestroyable
long
macrobiotic
protracted
longeval
extended
long-span
perpetual
secular
evergoing
long-lasting
longue durée
old-line
make old bones
eon
at length
inveterately
until the cows come home
with ages
lifetime
hot minute
ongoing
until the cows freeze over
permanent
continuing
chronic
decadeslong
old
longwhiles
donkey's ears
donkey's years
long haul
lengthen
longevously
for the long haul
eternity
plurennial
outkeep
longstandingness
longirostrate
donkey's