How did I renew my H1B visa stamp in Canada (Ottawa) within three business days?

INTRO
I recently renewed my H1B visa in Ottawa, Canada. My plan was to go back to my home country for 2 weeks during Christmas and New Year, and I was concerned about two things: (1) I heard many people got checked in my home country, and (2) two weeks’ time might or might not be enough for me to get my passport back (I…

