[How To?] How to limit title length in breadcrumb?

[Serpius]

You can modify _generate_breadcrumb() method in page class and limit the length of $crumb['name']
Or you can use jQuery.

I am not aware of your programming knowledge and whether this much information is sufficient or you need further guidance.

Or...

He/She can use the Advanced Sidebox plugin and define the length of the thread title to whatever he/she wants and it will end in an ellipsis. 

I think a few other "Latest Threads" sideboxes will do the same thing as well.

can't it be done without using a plugin?

Maybe, but you have to know coding/programming in order to modify the code to your liking.