Define the unit of a turn
A turn might be one short game round, a set period of drawing, or selecting one video for everyone. Ask whether the activity has a natural endpoint and whether each child wants the same kind of use. Avoid switching between time-based and round-based rules only when the result favors someone. If a round can run much longer than expected, agree on a fallback before starting. A visible timer may help some activities, but it does not solve an unclear definition of the turn.
Prepare the handoff
Show how to save, exit, and open the next person’s activity without changing their work. Include setup time in the arrangement if signing in is part of every switch. Do not share credentials between children merely to make the handoff faster. If the app cannot separate their projects comfortably, consider separate sessions with an adult’s help. Keep the device on a stable surface while changing users rather than letting the turn end in a physical tug-of-war.
Review fairness across the whole session
Notice who chooses first, who waits during setup, and whether one activity repeatedly consumes the shared window. Rotate the first choice if that matters to the children. If the arrangement remains frustrating, shorter sessions or different activities may be easier than more elaborate turn accounting. Ask what made the handoff feel unfair and address that detail. The goal is a shared resource people can use with confidence, not a precise spreadsheet of every second each child touched the screen.