If the job runs on multiple agents, the JobStatus contains aggregate information across all computers where the job runs. Use Job.RemoteAgents to get the same information for individual agents.
The statistics tracked by the JobStatus can be reset using Job.ClearHistory
System.Object
ArcanaDevelopment.adTempus.Client.ObjectBase
ArcanaDevelopment.adTempus.Client.ADTObject
ArcanaDevelopment.adTempus.Client.JobStatus