A total of about 13 hours.Looks fantastic. Just how labor intensive was that?
Layout was completely random. Knowing there was just over 500 bricks with a 5 color scheme made it quite simple. Started with a grey and beige using a random spacing of 4-5 bricks. Then filled in the rest with the remaining 3 greys. Working from the top (side to side) and down is what I have come to find helps speed the project along.13 hours. Obviously not your first time for this type of project. Well done.
Did you layout or determine the pattern of colors?