However, depending on the specifics:
* Transfer Credits: An ISM degree holder might have some overlapping courses with a CS degree that could be transferred as credit. This could potentially shorten the time needed to complete a CS degree. The number of transferable credits depends on the specific universities and programs involved. It could reduce the time by a semester or two, but unlikely more.
* Master's Degree Instead: A more realistic and potentially faster approach would be to pursue a Master's degree in Computer Science. This would build upon their existing ISM knowledge and typically takes 1-2 years.
In short, there's no set timeframe. It's either a full 4-year undergraduate program (potentially shortened slightly by transfer credits), or a 1-2 year master's program.