normally, amazon swords are considered average growers, so I'd say it would be a little faster than crypt growth unless you have some sort of fancy variety. I feel like the non-normal varieties take longer to grow, about the same as a crypt I guess.
What I did actually, was move the small not doing well sword into a smaller tank where it would get much more intense lighting, and then I'll move it to the larger tank when it gets bigger. Right now, in about the span of two weeks, it has tripled in size and quadrupled in number of leafs, and the type of sword I'm dealing with is an aflame sword. So you should be fine.