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It may be about a long distance kind of thing.
"How long an hour can take", implies he's waiting for something (for when he can see her...).
"I can always hear you breathe", when he can't talk to or see her, he can still remember the sound of her breathing.
"When you were asleep I got a little bit closer to you", while she was sleeping, another day passed, thus he was closer to seeing her again.
It may be about a long distance kind of thing.
"How long an hour can take", implies he's waiting for something (for when he can see her...).
"I can always hear you breathe", when he can't talk to or see her, he can still remember the sound of her breathing.
"When you were asleep I got a little bit closer to you", while she was sleeping, another day passed, thus he was closer to seeing her again.