I've never had an endli so I couldn't say, my del has been doing 1" per month and I assume that's about what they do. I could see it slowing down from 14"+. Again I may be completely off, just what I'd say would be healthy and normal
thats about right 1" a month roughly, my buddies slowed down at 9" for about 3 months and then had a ridiculous growth spurt when it went from 9" to 14" in 2 months