The duration of a wait step in an existing active smart campaign was modified from 2 days to 5 days. If there were 10 people in the Wait step when the step was changed, what would happen?

The 10 people would automatically follow the new duration. This is because when a wait step duration is modified in an active smart campaign, it affects all people who are currently in the wait step as well as new people who enter the wait step. The new duration will be calculated from the time each person entered the wait step. The 10 people would not remain in the old duration or error out and skip the wait step.