What does the tag do?

The <break> tag adds a pause to your SSML text. You can set a pause based on strength (equivalent to the pause after a comma, a sentence, or a paragraph), or you can set it to a specific length of time in seconds (# s) or milliseconds (# ms). If you don't specify an attribute to determine the pause length, the SSML editor uses the default, which is <break strength="medium"/>, which adds a pause the length of a pause after a comma.