A value that limits the number of characters in a row of stacked text. This length guides the decision on when to break long text strings into separate rows. The line break will be inserted between words, not in the middle of a word, so rows may be longer or shorter than the ideal. Depending on LabelDefinition.stackBreakPosition, the break may be inserted before the breaking word, or after.
The default value is -1. This means that a default length of 13 characters is currently used.