When you connect two loudspeakers to the output of a stereo amplifier, you should not have be sure about the lead-in wires to be equal in length to avoid a time lag between speakers because only the speed of energy matters here.
Since energy in cables moves at nearly the speed of light, the variation in time between signals arriving at various speakers will be too small for your ears to perceive, it is not required to make the lead-in wires to your speakers exactly the same length (making sure the resistance of your speaker wires is correct is much more important).
Thus, the length of the lead-in wires is not important and one should not be sure about it to avoid time lag.
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