Nikky's poem starts with a small observation: "always" is a funny word. It's a word people use constantly, especially when they're in love, and the speaker stops to question it. A boy tells a girl, in capital letters, that he will always love her. The capitals make it sound loud, certain, almost like a promise shouted. But the speaker isn't convinced.
The questions that follow are what make the poem work. Is always a day, a week, a month? A year, a decade? Each time span is longer than the last, as if the speaker is hoping for a bigger answer. Then the ending drops: "or just a few hours." That quiet last line suggests the promise might not last long at all.
The mood is doubtful and a little sad. The speaker seems wary, maybe hurt, or simply aware that big words are easy to say and hard to keep. The poem doesn't give an answer. It leaves you wondering what "always" is worth.