[galaxy-user] Runtime data?

Maybe this is in a simple place and I'm missing it, but where can I find simple runtime data for both individual tools and larger workflow executions? I have run several different versions of a saved history using the API and want to now see how the runtimes differ between them. It can be using the interface or API, that part doesn't matter. I just don't see how to look at a saved history and get any runtime statistics. Regards - Joshua