How long is an instant?
How long is now?
How long is Eternity?
How long is long?
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very nice, it could be a song lyric as well with a little pruning. It does have a few weak lines but the overall structure and repetition carry even those.
I've been thinking of some things along the same lines lately, but you've managed to put them into words. Really nice!
Time can be too long it can be too short wonderful poetry for me is like a long drink after a long time in the desert!