It doesn't seem excessive to me, though I tend to be rather verbose. When do you exchange them? Could you ask how long his is maybe?

Also, I don't know that it would matter how long yours is compared to his--it's more about the sentiment expressed within. Though I'm sure I'd have the same worry.

Another thing you could do is keep what you have, then paste it into a new file (assuming it's in an electronic format--just guessing that unless you have really tiny handwriting), try editing it, and see what you come up with. But keep the original in a separate file.