0I think you want "a couple month01b 00s'02b 00time" in 1. 02br 02br 00"As time went by" seems to be rather firmly set in the past, so I wouldn't use the present perfect. 0-
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01cite10Pieanne12cite10I think you want "a couple month11b10s'12b10time" in 1. To me the meanings of sentence 1 & sentence 2 are the same.11font10I'm not trying to establish any rules here, but I think I hear "months' time" more from the many British people I know living in my area.