I agree that its better to not message too long as you begin to paint a picture of a person in your own head. Also I have had men express lots of future taking, appeared lovely via text but not so much in person.
I have learnt through experience, to get to know the basics and meet for coffee asap. However, how long is reasonable?
Life is precious so for me, I like to have a good feeling about someone, chat for a little while, see if the conversation flows, things in common etc.
The thing is - people don't always turn out to be who they say any way, so why build up that conversation to begin with. Recently a few guys have asked to meet within exchanging a few messages? Before, this would annoy me but now I question if maybe this is the right thing to do.
I don't really know what the answer is.....