How long does it take to change a car battery?

That should give 30 or 45 minutes to do the battery replacement. And it should really only take about 10-20 min.

Local organizers focuses only on a village or nearby areas and does not require a lot of things. They also organize simple events such as birthday parties, anniversaries, marriages, etc. National organizers focuses on the whole country and usually organizes the events held by the government, example a welcoming party for another head of state, or an event that commemorates Independence. National organizers uses more things and the events are much more grand.