This article examines changes in completion rates and time-to-degree in Norwegian doctoral training over the last 30 years. A steadily increasing share of doctoral candidates holding a fellowship have been awarded their doctoral degree within five years; from 30% of those admitted in 1980 to 60% of those admitted 25 years later. Furthermore, the proportion of fellowship holders awarded a doctoral degree within 10 years increased from less than 50% to close to 80%. There are, however, large differences between fields. On the one hand, this is a success story, and the reasons for increasing efficiency in doctoral training will be analysed. On the other hand, the average time-to-degree is still regarded as being too long, and the non-completion rate still too high. The multiple causes for efficiency improvements are examined with reference to the international body of literature on doctoral training.