Scala/akka discrete event simulation

I am considering migrating a large code base to Scala and leveraging the Akka Actor model. I am running into the following conceptual issue almost immediately:

In the existing code base, business logic is tested using a discrete event simulation (DES) like SimPy with deterministic results. While the real-time program runs for hous, the DES takes a few minutes. The real time system can be asynchronous and need not follow the exact ordering of the testing setup. I'd like to leverage the same Akka code for both the testing setup and the real-time setup. Can this be achieved in Scala + Akka?

I have toyed with the idea of a central message queue Actor -- but feel this is not the correct approach.