It's later than you think
Time moves by quickly so ifyou have something to do or you want to enjoy yourself you should seizethe opportunity. You may have less time than you realize.
"It's later than you think", 言光阴易逝, 或有要事待办, 或想及时行乐, 都要把握时机.
*seize 抓住
*opportunity 机会, 时机, 良机