The duration of interior designing courses can vary depending on the level of education and the type of program. Here are common durations for different types of interior design courses:

Diploma or Certificate Programs:
- These short-term programs may have durations ranging from a few months to a year.
- Some intensive certificate programs can be completed in as little as six months.
Associate Degree Programs:
- Associate degree programs in interior design typically take around two years to complete.
- These programs provide a more in-depth education compared to short-term certificates.
Bachelor’s Degree Programs:
- Bachelor of Interior Design (BID) or similar programs usually have a duration of four years.
- These programs provide a comprehensive education in interior design, covering design principles, technical aspects, and often include internships or practical experiences.
Master’s Degree Programs:
- Master’s degree programs in interior design, such as Master of Interior Design (MID) or Master of Fine Arts (MFA) in Interior Design, typically take one to two years to complete.
- These programs are often pursued by individuals seeking advanced knowledge or specialization in specific areas of interior design.

It’s important to note that the exact duration can vary between institutions and countries. Additionally, some programs may offer part-time or accelerated options that can affect the overall duration of the course.

When considering an interior design course, it’s advisable to research specific programs, review their curriculum, and understand the time commitment required. Factors such as internships, practical experiences, and the inclusion of a thesis or final project can also influence the overall duration of the program. Additionally, ensure that the chosen program is accredited by relevant educational bodies to meet industry standards.