In the UK, postgraduate master's degrees typically take one to two years full-time or two to four years part-time. Master's degrees may be classified as either "research" or "taught", with taught degrees (those where research makes up less than half of the volume of work) being further subdivided into "specialist or advanced study" or "professional or practice". Taught degrees (of both forms) typically take a full calendar year (180 UK credits, compared to 120 for an academic year), while research degrees are not typically credit rated but may take up to two years to complete. An MPhil normally takes two calendar years (360 credits). An "integrated master's degree" (which is always a taught degree) combines a bachelor's degree course with an additional year of study (120 credits) at master's level for a four (England, Wales and Northern Ireland) or five (Scotland) academic year total period.