Around a metre, or 3feet, of leadcore.
I've had more fish with totally slack mainline and running leads on mono or fluorocarbon than with anything tight, and at short ranges on this lake.
Only one fish came from anything like distance, at about 100metres, when the weed hadn't come up in April time, and I was using 30lb Amnesia with a 3.5oz lead and a homemade helicopter setup, 2 beads at either length of a short section of tubing with the rig swivel in between.
Everything else fish wise for myself and others is at short range, less than 40metres, even when the weed hasn't grown up.