How do I know what is Long Term Capital Gains if I DCA for 12 months +

I did understand LTCG occur after one year holding a coin. But what does that ACTUALLY mean?
What if I DCA into a coin, and keep buying monthly and never sell for an entire year.
Does that mean that if I sell after 12 months from my first buy, only the amount that was bought in the first buy will be LT and everything past that amount will be ST? Or you can sell your whole bag as LT as long as you started buying and haven’t sold in 12 months.

This is so confusing to me, and rarely addressed / explained with clear examples.
I would really appreciate any help!

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