I use either 40 or 50# Maxima and over the course of a day usually only cut a bit off a couple times a day... That means at least a couple dozen fish between leader adjustments. Two things to realize, too; pike are chasers and tail biters so articulated stuff with "Fenwick Iron Thread" for articulations is a good idea, and tube flies solve a lot of problems.

We use a lot of bunny leeches... they are tough enough to handle a ton of fish... Use plenty of CA glue on them and they will go until you lose them...