Comparison of the turn-over time, τ, evolution (upper panel) based on the empirical relation proposed by Wright et al. (2011, solid orange line) and a constant value of 100 days (dashed black line) and the corresponding magnetic field complexities, n (lower panel). The shaded region corresponds to the period gap for non-polar CVs according to Schreiber et al. (2024). The dashed grey vertical line indicates the lower period gap edge according to Knigge et al. (2011). The assumption of a constant turn-over time is not justified, and it is incompatible with the condition n < 7.