around-the-clock
ceaseless
consecutive
constant
continual
day-and-night
dogging
endless
free-burning
incessant
never-ending
nonstop
perpetual
persisting
round-the-clock
straight
sustained
unceasing
unremitting
abiding
accordant
ageless
alike
articulated
automatic
balanced
catenated
chronological
coeternal
concatenated
connected
consistent
consonant
continued
continuing
correspondent
cyclical
dateless
direct
durational
durative
equable
equal
eternal
eterne
even
ever-being
ever-durable
ever-during
ever-recurring
everlasting
everliving
extended
featureless
flat
frequent
gapless
haunting
homogeneous
immediate
immemorial
continuity
continuum
actual
normal
steady