How long would it take me to become an registered nurse?

I'm not in the nursing field, but if you're wanting to get a BSN (bachelor of science in nursing), some of the "general education" (or "liberal arts") classes already taken during the first bachelor's degree program (e.g., history, English, college-level math, art history, and psychology) may transfer. If the science and/or math courses were taken more than 7-10 years ago, those course credits may *not* transfer or count, so the individual shall need to re-take them. Please speak with the "admissions" department before applying to the program(s) for further info.

Each nursing program may have slightly different pre-req courses and requirements, however, some typical pre-req classes include biology, chemistry, "general" anatomy & physiology, and/or microbiology. It's my understanding that biology is typically a pre-req course for "general" anatomy & physiology, so it may take one or two semesters of biology prior to taking anatomy & physiology. That may be *in addition to* the two years for the (full-time) BSN program.

Before taking pre-req courses for nursing (or any field), please do some "job shadowing" of BSNs (with prior staff approval), such as at an acute-care hospital, physical rehabilitation hospital, nursing home, and/or pediatric hospital.

Just an fyi that a physical rehabilitation hospital may treat patients with Traumatic Brain Injury (TBI), spinal cord injury/paralysis, stroke ("brain attack") - which is a type of brain injury - multiple sclerosis (MS), other neurological disorders, amputated limbs, hip/shoulder/knee replacement, for instance.

Two years
Your other degree just takes care of the general education courses not course work, unless you took some RN related course as electives.

3 years

Depends which country - I am in UK and daughter done 3 year BA in psychology and then a 2 year Masters degree in nursing.

completing a course for registered nurse, a nursing college might be a two year course

You either find an accelerated RN program for someone with a bachelors but still take the pre reqs (2 ish years) or do a regular bachelors but get credit for the gen eds, 2 ish years depending. Possibly 1 extra year for the pre reqs.