How long do weighted blankets last before beads leak?

This is a recurring complaint in r/WeightedBlankets threads, where one verified user reported their bamboo-and-glass-bead blanket started leaking beads after about two years. Tighter stitching patterns (sub-quarter-inch stitching, smaller 2x2-inch bead pockets) and lock-bead construction are the features reviewers credit when a blanket survives multiple washes without leaking.