Correct
没日没夜
/ méi rì méi yè /
Strokes
Definition
day and night/regardless of the time of day or night
Example
Definition
(work) day and night/night and day
1
Méirìméiyè
没日没夜
dì
地
gànhuó
干活
duì
对
shēntǐ
身体
méi
没
hǎochu
好处
。
Working round the clock does no good to your health.