As a shooter you should not have to wait at your club for all shoot-offs at all sites to be completed. Each club will manage shoot-offs independently from the other clubs under the direction of the overall shoot manager and posting those shoot-off scores to the iShoot application as they are completed.
The process detailed above in the first answer reduces the likelihood that any two shooters at different clubs would miss the exact same three targets over the course of the first two boxes of an event shoot-off. Each club will ensure all ties are broken at their club.
You as a shooter will shoot-off until missing the number of targets determined by which round your first miss is recorded and all ties you are involved in at your host club are broken. Once you have done so you can use the online scoreboard to track the final results of the event.
Once all shoot-offs are complete at the Host club there is no reason to remain at the club until all shoot-offs are posted as you can check their status from anywhere with your hand-held device.