WSET Level 4 Diploma, Unit #4: Spirits of the World is usually taught over four sessions. The WSET allows its Approved Programme Providers to offer the examination up to three times per year – once in January, once in June, and once in November. The exam takes one hour and five minutes, usually from 4:30 to 5:35 pm. It includes a tasting assessment of three wines, as well as several essay questions related to material covered in the Unit. You must have taken the WSET Level 4 Diploma, Unit #2 exam before registering for this, or any other, Diploma unit.