If I want to ask how long an event/activity lasts, can I ask "what is the time period of this event/activity?"
Is there any other ways of phrasing this?
Also I'm confused between
the time period and
the period of time. If I want to refer to something happened in the middle of an event/activity, should I say "during the period of time of this event" or "during the time period of this event" or just simply "during this event"?