Adding my experience with the temporary passport process:
Just got my original passport reactivated in Toronto (Victoria St offices). They insisted on keeping my passport for a day and a half - said it can take up to 24 hours for the reactivation to be fully processed and they wanted to make sure it worked before returning for me. I dropped it off Tuesday afternoon and picked it up Thursday morning. Something to keep in mind!
Thanks again @ToddD for this post - it was so helpful!