Time since the last collision (evaluated each time a collision happens) from the perspective of a growing planet as a function of time, for all 18 potentially habitable planets in the regular scenarios with our model. Small crosses count all collisions, large ones only impacts by embryos and protoplanets (i.e., excluding planetesimals). Each collision is assigned two data points in general – a small and a large cross – and if the last impacting body was an embryo or protoplanet then they coincide. The continuous and dashed lines indicate elapsed time (since the last collision): since simulation start (upper line), 1/10 of that time (middle line), and 1/100 of that time (lower line).