hi there - congrats on passing the viva! i did mine recently too, also got minor corrections and they don't look that minor to me! i think being told that you're 'on the cusp' is best ignored - they just want to rain on your parade - don't let them. I think the difference between minor and major is quite subjective and definitely varies hugely depending on the university. My external came from a university where the time allowed for minor corrections was 3 months, and here it's 2. She's given me three month's of work anyway and i'm expected to get it done a month earlier (?*?).
re. the report - at my university you have 2 months from the date you receive the report- you have to be sent an official letter through the mail. - it's really unfair if you have less time to do it because the examiner is dragging their heels. Good luck with it anyway!