guāng yīn sì jiàn
time flies like an arrow (idiom); How time flies!
xū dù guāng yīn
to waste time on worthless activities
yī cùn guāng yīn yī cùn jīn
lit. An interval of time is worth an ounce of gold. (idiom)
fig. free time is to be treasured
cùn jīn nán mǎi cùn guāng yīn
An ounce of gold can't buy you an interval of time (idiom); Money can't buy you time.
Time is precious.
yī cùn guāng yīn yī cùn jīn , cùn jīn nán mǎi cùn guāng yīn
An interval of time is worth an ounce of gold, money can't buy you time (common saying); Time is precious and must be treasured.