20 months in, and still no signs of easing up. I thought it was easing up around the 16-18 month mark, but nope, just a few weeks ago I started another growth spurt and they started hurting the most they've hurt in this entire process.
My roommate is 5 years on E now, and still getting growing pains.
It will probably start easing up after a year or so, and only return in spurts after that, but there could still be soreness spurts for a VERY long time after that.