The Manual send process wait value and unit of time (seconds/minutes/hours) won't update from the 71 Seconds values that were imported into v6 from v5. No matter what I change them to (e.g. 1 minute, 10 seconds), when I click on Save they revert back to 71 Seconds. So I closed Configuration in the Dashboard. Then I went into phpMyAdmin and changed the value of ggf_acym_configuration.queue_pause from 71 to 1 and watched it save to 1. Then I reopened Configuration, Queue Process and saw my change was now 1. So in the Dashboard I changed it from 1 to 2, hit Save and reverted back to 1.
I think you have a bug and it probably affects the Seconds/Minutes/Hours drop down box as well. I just didn't bother to verify that since Seconds is what I wanted.