10 weeks of echolocation training
Norman and colleagues trained blind and sighted adults aged 21–79 for 10 weeks; both improved a lot, and blind participants reported better mobility.
As reported in: Norman, Dodsworth, Foresteire et al. (2021). Human click-based echolocation: Effects of blindness and age, and real-life implications in a 10-week training program. PLOS ONE. doi:10.1371/journal.pone.0252330