Depends on depth and how many rods I am running. If I am running two leadcore per side, I try not to violate the “v” pattern principle of trolling with the outside lines wider, higher in water column, and further back. With the v pattern in mind, I have the amount of leadcore in feet labeled on the reel so I know how much backing I need to let out on the short core to extend past the long core running inside. It helps to have linecounters but you can count lineguide passes. If I am over 40’ with an eight color, I am probably going to clip release to backing just past the knot. If I am over 55’ with the same leadcore, I would not hesitate to slowly release 50’ of backing before clipping on release.