Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: What do you say to time as it begins to pass you by? "Ta ta (た), Time!"
I was so into the game I didn't notice the time pass.
How many years have passed since Tofugu started?
"Do you think they will have a happy marriage?" "Time will tell."