Domino waves

Two identical rows of $\num{1000}$ dominoes are initiated in two different ways:

• In row A, the first domino is barely tipped over, and hits the second domino in $\SI{1}{\second}.$
• In row B, the first domino is pushed so that it hits the second domino in $\SI{0.3\bar{3}}{\second}.$

How long will the two rows take to finish falling?

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