养兵千日，用兵一时
yǎng bīng qiān rì , yòng bīng yī shí
lit. Train an army for a thousand days to use it for an hour. (idiom); fig. extensive preparation eventually pays off
yǎng bīng qiān rì , yòng bīng yī shí
lit. Train an army for a thousand days to use it for an hour. (idiom); fig. extensive preparation eventually pays off