It depends on the wire. Electrons don't see the length of the wire. They see resistance, inductance, and capacitance. A 2 meter interconnect can look "longer" than a 5 meter one. For line level interconnects, low capacitance is the main issue.
It also matters what is the output impedance of the line level output. A solid state output with 10-50 ohm output impedance will tolerate long interconnects. If you have a tube preamp, 200 - 600 ohms output impedance, interconnects can be critical.
It also matters what is the output impedance of the line level output. A solid state output with 10-50 ohm output impedance will tolerate long interconnects. If you have a tube preamp, 200 - 600 ohms output impedance, interconnects can be critical.