This option is available with the simulator <Displacement>.  The simulator <Displacement> depends on equations which are based on the fundamental laws of Physics, of Chemistry, and of Rock Mechanics.  It

Simulates the mechanisms which take place during a blast, starting at initiation till the burst out of the rock mass; in particular, it simulates the rock displacement velocity U at the vertical free face of the bench.  The Optimum Delay, or DSB Delay (Dupont Sequential Blasting Delay), is based on the experimental criterion according to which the best fragmentation is achieved if the roc at the face moves a distance of 1/3 of the burden B before initiation of the next row.  Thus a knowledge of U and B allows the DSB Delay to be calculated; if the user chooses to include the option <Optimum Delay (DSB)>, each simulation with the simulator <Displacement> informs him of the value of the DSB Delay.