It's not exactly 10 minutes. Check the blocks. It's probabilistic.
https://image.nostr.build/5e2d3c6bdb1bcc5f3dd2ae71bf3adee61d47d30cc62fd35ac0c0d62c273d26c3.png
You sometimes see blocks show up a minute apart, or even 40 minutes. If it doesn’t maintain a consistent average over a two week span, the difficulty adjustment will take care of it.
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