In model builder (for Arc GIS 10) is it possible to run two or more geoprocessing operations concurrently?

For example I have to run repair geometry on 2 files and then merge them. Currently it repairs topo of file A and then file B and then merges them. Each file takes about 30h to repair. Can I get it to concurrently repair A & B, wait for both to be complete and then merge them.

At the moment I have to open two instances of arc catalog and run the repair tool on a file in each and once complete do a merge which means that I have to come in to office to check when both are complete...on a quad core, each repair process only uses 1 core at a time.

The above example is simple but if multi-threading is possible where multiple operations are run concurrently (if they don't depend on each other) and wait for the depended files to be complete before the next process is run.

Thanks,