all the time

1.  Also, all the while. Throughout a specific period, as in All the time the music was playing she tapped her foot, or The baby slept all the while the fire was being put out. [Late 1400s]
2.  Continuously, without interruption, as in That old refrigerator is running all the time.
3.  Frequently, repeatedly, as in He goes to that store all the time.

The adverb has one meaning:

Meaning #1: without respite
  Synonym: day in and day out