How long do I have the musicians for?

1.5 for ceremony only and 3 for ceremony and cocktail hour

Your musicians are contract for a "block" of time. For example, a 1.5 ceremony hour block might look like 4pm-5:30pm, or a 3 hour block could look like 4pm-7pm, ect. Musicians are allotted time for one small break within the a 1.5 hour block if needed, and two small breaks for 3 hour blocks.