Neurons were dissected from rat cortical brain, incubated for 16h to allow initial growth, and followed by image acquisition every 6h up to 70h after plating. **(A-B)** The growth dynamics of two example neurons, one with a low (A) and one with a high (B) outgrowth velocity, are shown over given time-period. **(C)** At each timepoint we quantified the length of the longest neurite of each neuron. Histograms show the length distribution of all longest neurites at the indicated timepoints. **(D)** At each timepoint we identified the top and bottom 10% and 25% quantile length as well as the median length. Exponential interpolation of the lengths for each selected quantile documented outgrowth velocities ranging from 0 to ~20 μm/h.