It's how much time was taken on each move.
the black & white bars next to each live chess move
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Thanks. Is there any particular reason that's of interest, move by move historically?
Wonder why not clarified anywhere obvious, unless I missed it.
I've tried searching; where does it explain what they mean? The bars & associated numbers to the right of the board, to the right of the move notations, in the game tab of live chess games.