i had one for about a year--not the same one--
and i never washed. this is before i knew what i've learned of lhcf, but if i had to do it again, i think i wouldn't change a thing. my hair grew a bit past bra strap length. i kept the weave in for 3 months each time and would just spray my hair underneath. when i took it out, my hair was the longest it had ever been and healthy.
it later broke off because i was ignorant about chemicals and jacked it up. now, i'm try to grow back. a stylist i know said that she never washes her hair while wearing a weave either. she said she contributes that to hair growth.