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The longer the cord is the more resistance there is; ie the more electrical load on the circuit. As long as you are pulling less than what the circuit and cord is rated for, there isn't an issue, you will just be wasting a little extra power from the extra resistance. The plugs themselves can also have a bit of extra resistance.
Two pieces of advice that will make the biggest difference:
Keep the total length of all extension cables used as short as is reasonable. Don't use a 20m cable when a 4m cable will do.
Buy extension cords with higher wire gauges (higher wire thicknesses). A 12 gauge cable (4mm^2^) will provide notably less resistance than a 14 (2.5mm^2^) or 16 gauge cable (1.5mm^2^). The packaging will say what gauge it is. Note, I'm talking about the thickness of the metal itself, not the thickness of the extension cord as a whole. I have seen some very, very thick extension cords with absolute trash wires inside.
The more resistance there is, the less the electrical load is. Maximum electrical load would be a short circuit (near zero resistance, maximum current flow); minimum would be a cord or device with infinite resistance (no current flow).
Considering V=I*R and P=I^2 * R, increasing resistance will decrease current and this will decrease power.