longsome
overtedious
endless
interminable
eternal
overprotracted
overlong
dragging
tiresomely
tediously
boringly
soul-sucking
forever
drawn-out
for hours
long
take one's sweet time
dree
overkeep
superlong
aeon
eudemic
eon
until the cows freeze over
ultralong
until the cows come home
hot minute
eternity
lifetime
unspeedy
rigmarole
spout off
overslack
long as one's arm
mundane
Rome wasn't burned in a day
long-span
hassly
longwhiles
sloggingly
forever and a day
linger out
overhard
overlax
time-consumingly
hard sledding
chronophagous
longsomely
wearilessly
grind
strung out
rough sledding
unweariably
Rome wasn't built in a day
slow
crow's age
at length
lengthy
overhurriedly
prolonged
month of Sundays
inveterately
years
protracted
ambisinistrous
extended
coon's age
light year
squab
spastic
TL;NR
prolongedly
leadfooted
semihard
hard going
exhaustedly
like the clappers
perendinate
overminute
sweaty
trance
hard as iron
uneasy
slack
not worth the powder
grip
overexhaustion
Sisyphean
galumphingly
overstride
donkey's
age
lazyish
ages
longish
blue moon