This is some serious technology. It's not trying to sell you some junk, its just pure hardware to affect a biological response. I wonder how long the effects la

This is some serious technology. It's not trying to sell you some junk, its just pure hardware to affect a biological response. I wonder how long the effects last? How often do you need to be wearing this thing? What about your local environment, is it more difficult to maintain a sense of north in places without a uniform, cardinal direction based street grid, or some nearly constantly visible landmarks on the horizon for example? The sun alone can't be relied upon beyond just a general sense of vague north, since it changes its course throughout the year.