[drmaa-wg] How long to use a Session?

I have a daemon process that periodically submits jobs to SGE. I have a separate thread that uses Session.wait(JOBS_IDS_SESSION_ANY) to gather the JobInfo objects, for example to add to a completion queue. The session may be idle for long periods of time. Should I use a single Session for the entire duration of the application, for each submitted job, or something in between? jeff