Adobe "bounce" metric shows 70K bounces. Time on page "bucketed" and "granular" metrics show 20K visits with time on page from 1 second to 30 minutes. If only 20K are actual visits then why does the original "visit" metric show 90K?
The time on page dimension needs atleast 2 hits in a visit to calculate Time spent and if there are more than 2 hits in a visit it is not considered as Bounce. Hence the against Time related dimension you will always see the proper visits.