隨時

随时
suíshí
  1. at any time; at all times
  2. at the right time; whenever necessary

CEDICT

Entry Composition

1 隨 suí
  1. to follow
  2. to comply with
  3. varying according to...
  4. to allow
  5. subsequently
2 時 shí
  1. o'clock
  2. time
  3. when
  4. hour
  5. season
  6. period