It can’t be a smilie because nothing is being compared using like or as. It can’t be onomatopoeia because the following words is not used in that quotation, POW, WOW BOOM etc. It can’t be metaphor because nothing is being compared without using like or as, and it can’t be rhyme because nothing in here is being rhymed so it has to be Assonance.
Time passes quickly.It is a way how things move, it depends if your bored then you feel like time is going to slow and when your having fun it's like wow already!