  How to compute the probability distribution of a detection time, i.e., of the
time which a detector registers as the arrival time of a quantum particle, is a
long-debated problem. In this regard, Bohmian mechanics provides in a
straightforward way the distribution of the time at which the particle actually
does arrive at a given surface in 3-space in the absence of detectors. However,
as we discuss here, since the presence of detectors can change the evolution of
the wave function and thus the particle trajectories, it cannot be taken for
granted that the arrival time of the Bohmian trajectories in the absence of
detectors agrees with the one in the presence of detectors, and even less with
the detection time. In particular, we explain why certain distributions that
Das and D\"urr [arXiv:1802.07141] presented as the distribution of the
detection time in a case with spin, based on assuming that all three times
mentioned coincide, is actually not what Bohmian mechanics predicts.
