1."In fact,we used to call each other 'Old Friend'--when we'

1."In fact,we used to call each other 'Old Friend'--when we'd meet,that is."
这句话后一句when……that is,是什么结构?‘d是would 还是had?
2.A half hour (went by) before the manager returned to the meeting hall.
为什么不填had gone by?