Shorter Content For Main Page Posts

Hi,
Is there a way to reduce the text from journals that are displayed?
I'm trying to get them to display with about 80 words with a "Read More..." link at the end that they can click or they can click on the title to view the full article. I've managed to add the Read More... link at the end of the blog\content\_theme_default\journal.htm file by changing

<div class="panel-body">
            {information}
</div>

to

<div class="panel-body">
            {information}
            <br>
            <a href="{url}" title="{url_text}">Read More...</a>
</div>

Some of our articles are 1600-2500 words so to have them displayed in full while people are flicking through the website is going to be a pain for them.
It would be great to truncate them on the main page and on the categories pages but to only have them in full if a reader wants to.

Thanks

Carl