Time since virial infall for satellite dwarf galaxies at z = 0 as a function of their distance to their host, d, or as scaled to the host's virial radius, R_vir, at z = 0: time since first crossing within ﹩{R}_{\mathrm{vir}}(z)﹩ of any host halo (top row) or within ﹩{R}_{\mathrm{vir}}(z)﹩ of the MW/M31 halo (bottom row). Left to right, columns show satellites of increasing M_star. Curves shows the median, shaded regions show 68%, 95%, and 99.7% of the distribution. At all masses, satellites closer to the host fell in earlier, though with significant scatter. Dotted line at z = 6 indicates the end of cosmic reionization; even for the lowest-mass (ultrafaint) satellites at the smallest distances, where they are observable, ﹩\lt 4\%﹩ were a satellite in any host halo during reionization, and none were in the MW/M31 halo during reionization.