Hello carDiO! Although PublicHealth pretty much answered your question, I wanted to provide additional information about your inquiry. Having recently applied to two Counseling Psychology PhD programs (and accepted to both), I can understand where your fiance' is coming from.
Now, here's how the practicum, internship, dissertation and classes all fit together. Most Counseling Psychology programs have three years of coursework, and one year of an APA approved internship. A student takes courses and gains practicum experience simultaneously. Practicum is an opportunity to apply the knowledge you have learned during coursework. Some programs have counseling centers or clinics within the program where a student does the practicum, while other programs encourage you to seek practicum outside the department. After the 3 years of coursework and the practicum, you apply for the APA accredited internship. A student can apply to internship sites all over the country, even overseas. Some students are able to complete their dissertation while on internship; others take an extra year or so to complete the dissertation and doctorate requirements. That's why people aren't able to pinpoint exactly how long it will take to complete a PhD program. 4-5 years is an approximation (but PublicHealth already explained that.)
I hope that helps. Good luck to your fiance'.