This compression system is a very handy invention, especially for Web users, because it lets you reduce the overall number of bits and bytes in a file so it can be transmitted faster over slower Internet connections, or take up less space on a disk.
Concrete hardens to 600PSI (Minimum) after 24 hours. This means that 5 three grown men could all stand on a pogo stick (if that were possible) who's base covers 1 square inch without harming the concrete. You walking with shoes on exert about 10 PSI, well below anything that could damage the new pour.
We walk between half and one hour each morning before breakfast and intersperse that with two or three long walks in the final two weeks before we go. However, we believe the only way to fully harden up for a long walk is during the walk itself, so the first three to five days of the actual walk must be taken carefully.