Usually, I turn off the heater while I’m sleeping.
Meanwhile, I shoved my lunch in my mouth.
In the time it takes to build a raft we’ll die of starvation! Wouldn’t it be safer to just swim across the river?
The kanji and the word are exactly the same. That means they share meanings as well.
Don't confuse this with 〜間 which is similar in meaning but different in reading. The 〜間 means it's attached to something. This is a standalone word.
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word:
In terms of intervals of time, time goes stagnant when you arrive in Idaho (あいだ). No time intervals move when you're there. Imagine this actually happening. You're looking into the state of Idaho and seeing everyone move at a snail's pace because time moves differently there.
If you don't know where Idaho is, you can alternatively think about a mnemonic you'd make. You say: "In terms of a new mnemonic, I'd uhh... (あいだ) uh... I can't think of anything better, that's a hard one!"