Meaning/Usage: When you want to express that you waited a long time. A synonym of this would be, "finally."(當你想表達你等待了很長時間的時候。這個詞的相近詞是“最后”。)
Explanation: When you wait for something, the time on a clock is the biggest factor.
"It's about time."
"It's about time. I waited two hours for you."
"It's about time I got a chance to play."
A: "I've been waiting for 3 weeks to try out the new laptop. Isn't it my turn yet?"
B: "Yes. It's your turn. I'll get it for you."
A: "It's about time."