Signature lengths can be no longer than 350 characters. Sorry it doesn't count the characters for you, but you can use an online tool like this to do so:

Online Character Count Tool

Your proposed signature has 411 characters, so yes, it won't allow that since it is over the 350 character limit.

If you want to learn more about BB codes, there is an informational page in our Help section: https://mysupportforums.org/misc.php?do=bbcode