So here are the exact details of what I was doing to get the delay / pause I was looking for:
assign a word to a Var (variable set block):
Variable field: Var1
Value = "test <break time=\"3s\"/> delay"
Speak block
Message field: <speak xml:lang="en-US"> {Var1} </speak>
The result was that there was a 3 second delay between the words "test" and "delay"
I found that if I didn't include the "<speak xml:lang="en-US">" and the "</speak>" in the speak block, the "<break time=\"3s\"/>" was read literally instead of interpreted as control language.