When running a simulation from Project Navigator, the default simulation time is 1000 ns. How can I make the simulation run longer and/or change the default run time?
To change the default simulation time, right-click the Simulate process in the Processes window, select Properties, and then change the Simulation Run Time property.
After the simulation is running, the simulation can be run for additional lengths of time by clicking the run icon or by typing the run command at the ModelSim command prompt. For example:
VSIM> run 100 ns
For additional information about running a simulation from Project Navigator, please see (Xilinx Answer 18216).