In this editorial, the Editor-in-Chief considers the question of 'how much is enough?' in health professions education and health professions education research, and she explores some of the implications of how this perennial question might be answered.One of the most important questions in a field of professions education (HPE) is 'how much is enough?'. This question can take different forms, such as 'when have we sufficiently trained an individual?', 'when have we sufficiently assessed an individual's suitability for practice?', or 'how much effort should we put into selecting and training tomorrow's health professionals?'. The details may differ, but the underlying question is the same. Important as this question is, and although it is implied in the articles and studies we publish in this Journal, it is rarely addressed directly. This is not a criticism. After all, it is a very difficult question to answer either succinctly or meaningfully. Indeed, we might spend a lifetime trying to answer it and yet still not come up with anything definitive.In part, this may be because the issues at stake are more philosophical than practical. For instance, what do we mean by 'enough' or 'sufficient'? These concepts imply quantification; they suggest levels or volumes of something that have to be acquired or demonstrated, such as knowledge, expertise, experience, or competence. Even when quantification is not the primary goal, the question is implied in much of what we do. Even in this issue, I see the question implied in Bennett-Weston et al.'s (2022) review of the evidence on how patients should be involved in HPE, it is implied in Morishita et al.'s exploration of physician experiences of illness (2022), it is even implied in Gesing et al.'s (2022) study into equity issues related to graduate salaries.However, given that healthcare professionals do not stop learning (we hope) the moment they qualify and that, despite the entreaties of competency theorists, HPE is still very much time-based, then the question of 'how much is enough?' also implies a time dimension. This