That doesn't seem excessive given the circumstances, at least to me. And it's okay if he doesn't write as much as you did. Doesn't mean your length is bad.

L and I can write long communications with each other. T calls them "novels". Sometimes I write novels, sometimes L writes novels, sometimes we both do. It's just however much we need to say. And responses vary, too. Sometimes we just can't do the original justice and so we respond with less.

I just think it's best to write what you need to write.