1. A method for estimating a duration of simulating a process embodied in a directed graph comprising: loading a directed graph for traversal in a simulation engine; identifying a plurality of nodes in the directed graph; estimating a duration of simulation by the simulation engine for individual ones of the nodes; summing a duration of simulation for the individual ones of the nodes to produce an estimate of a duration of traversal of the cyclic directed graph; and, presenting the estimate in association with the traversal of the directed graph by the simulation engine.