That depends, if its a full CMP match (meaning 200 yards) you should have pit duty. Besides your shooting relay, you have a relay of scoring and pit service. Some have three relays, Shooting, scoring, pits, some have four, two relays on the line shooting and scoring, and two in the pits.
If it s a 100 yard reduced target match, then it depends on the number of competitors and targets available. Sometimes you can get by with two relays and it goes pretty quick.
Best thing to do it call the match director and see. Sometimes, if you have a CMP GSM MI, they have a clinic before the match. I like to combine Clinics and Matches.
When I run into that problems I send the wife out shopping. A new dress wipes out a 6 hour match.
