Precession (top panel) and alignment (bottom panel) timescales for a global precessing disc, plotted against black hole spin (a) for three stars of different masses being disrupted, assuming log[M_BH/M_⊙] = 7.2 (Appendix A). The shaded regions enclose the uncertainty on each timescale due to the 1σ uncertainty on log[M_BH/M_⊙]. These timescales were computed with H/R = 0.1 and α = 0.1, following Franchini et al. (2016). The dashed red line in the top panel denotes the observed 3-day modulation timescale observed in J2344, and the vertical grey lines denote the spin values that make T_prec consistent with 3 days (e.g. a ∼ 0.6 for a Sun-like star), highlighting that spin constraints derived from this approach are sensitive to the assumed mass of the disrupted star.