Duration vs. recurrence time relation for all known QPEs. The black contours represent the newly added J2344. We conservatively estimate a lower limit on the recurrence time of 11.7/2 h. This accounts for the possibility of missing an intermediate broad flare, due to modulations of the QPE amplitude (e.g., Giustini et al. 2024). The top left shaded area corresponds to a duration time greater than or equal to the recurrence time.