Screen-time and session-length controls are available from Settings → Family Controls on the parent dashboard.
You can set a daily time limit, a maximum single-session length, or both. When a limit is reached, the tutor gives a short heads-up before wrapping up — sessions aren't cut off mid-explanation.
Limits can be scheduled differently for school days vs. weekends, and can be paused temporarily for exam prep periods without changing the permanent configuration.