Visual timer apps are a staple in my mTool kit. Here are a couple that are free today:
Timer + Touch HD (iPad). This app changes orientation on the iPad (which is annoying when it doesn’t like the one I use!).
Timer app (iPhone/iPad) – Your standard egg timer app.
Visual timers are good for many situations and age groups (how often do you set a timer for yourself? It work!). Check them out – free is good (unless you already have too many apps!).