I've always found them to last OK anyway, but they now apparently last 40% longer + 40% longer than that, whatever they works out to with maths.
whatever they works out to with maths
To a close enough approximation, 1.4²=2
@snottyotter started
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I've always found them to last OK anyway, but they now apparently last 40% longer + 40% longer than that, whatever they works out to with maths.