The time you spend waiting to get on an elevator depends on the algorithm it uses to determine which floor to go to next. A good elevator algorithm can be measured by a variety of factors ( wait time, time spent inside the elevator, current elevator occupancy, energy usage, etc.), but it is up to the elevator's owner to determine which factors it wants to prioritize. Consequentially, there are many different alogrithms an elevator can have. Still, there is one algorithm more famous than the rest and it is appropriately named...
Explain how it works here