This work will take months with
development time in hours per hour of simulation duration ranging from 217 to 3080 (Chadwick (2002) 300 hours/hour; de
Hoog (2002) 3080 hours/hour; Brandon-Hall (2002) 750-1300 hours/hour; Summers (2003) 1200-1500 hours/hour; Chapman
(2010) 217-716 hours/hour and Meyer (2009) 320-731 hours/hour). This means that the development of a simulation with an
eight-hour duration will take between 11 man-months and 15 man-years. Besides duration, development time is influenced
by complexity and novelty (Hall, 2009), the availability of platforms & model libraries (Hall, 2004) and whether an existing
simulation can be customized (the topic of this paper). Where a simulation exists and is customizable, development times
can be reduced radically