* The specific degree: A Bachelor of Science in Engineering will likely have far fewer electives than a Bachelor of Arts in Liberal Arts.
* The institution: Different universities and colleges have different requirements.
* The major: Even within the same university, different majors will have different elective requirements to accommodate their core curriculum needs.
While some programs might have very few electives (maybe 12-18 credit hours), others could have a significant portion of their degree comprised of electives (potentially 30-40 credit hours or more). A reasonable range to expect, for a bachelor's degree, is between 15 and 40 credit hours, but this is just a broad estimate. You must consult the specific degree requirements of the institution and major you are interested in.