Not as long as T-9 on an N95 and just a little faster than on my work-provided Blackberry.

And I think if the point is to convey information it is a fair trade off to take extra time to compose instead of forcing your intended audience to take extra time to listen. The only real downside to sending a text is that inflection is lost, so you'd better take extra time to make sure sarcasm (for example) is stated as such. But that's where emoticons and tags come in handy!