I've got a 70" wingspan B-17 from EAM and it's powered with four outrunner motors and four ESCs. The ESCs are are located in the nacelles and are soldered directly to the motor leads with 4" wires. The ESCs battery leads are wired in parallel with the inner length of wire being about 12" and the outer lengths of wire being another 10". The battery packs are then connected to a three way parallel connector which ends in a single Y at the wing roots. The total length between the battery and outboard ESCs are about 26". The motors draw 20 amps each at full throttle. I'm using 16 gauge wire and I've had no problems with glitching at all. And since I'm using 3s, I'm also using the ESC's built-in BECs. Those are connected with similar lengths of servo extensions, also no problem.

I ran a test of the above motors with wire lengths of approximately 36" before I installed the system in the model and it worked fine. No glitches at all. The wires even run together with the ESC, aileron servo and retract servo leads and there's no problems at all.

My 8 lb B-17 flys with great authority on about 800 watts. I wouldn't want any less power.