光阴

time available

light / ray / CL:道[dao4] / bright / only / merely / to use up

surname Yin

overcast (weather) / cloudy / shady / Yin (the negative principle of Yin and Yang) / negative (electric.) / feminine / moon / implicit / hidden / genitalia

variant of 陰|阴[yin1]

An ounce of gold can't buy you an interval of time (idiom); Money can't buy you time. / Time is precious.

to waste time on worthless activities

lit. An interval of time is worth an ounce of gold, money cannot buy you time. (idiom) / fig. Time is precious and must be treasured.

lit. An interval of time is worth an ounce of gold. (idiom) / fig. free time is to be treasured

How time flies! (idiom)

time flies like an arrow (idiom); How time flies!