Duration

The time period during which the Entity is present. In this frame, Duration may be expressed with for preceding an event which stands for the duration of the event. In cases where the Entity is sentient, there may be an inference that the Entity's intent is to be present so as to participate in the event. I can be present for the first half of the ceremony and the last part of the reception, but I'll have to leave in the middle. A catalyst should typically be present for the thermal and/or photochemically induced curing of the coating composition applied onto a suitable substrate.