This should be the number of times you are likely to carry out that activity. For example, if it is one session each week, add the daily hours i.e. 3.45 then the number of weeks you are expected to deliver that activity. If you would carry it out every week you would enter 42 weeks, as that is the number of weeks that you are available after deducting annual leave and study leave. If you deliver that activity every other week then enter 21 instead.