I know how the Notion formula works. But when the date is the same and the time is different, this formula seems to not work properly. So what’s the right way to calculate this in Notion?
If you want to count time rather than date in Notion, you should use the timestamp formula. The output of datebetween formula is "days", and minor data will be ignored. While the unit of the timestamp formula output is millisecond. 1000 millisecond = 1 second, it should be easier to transform it into any unit you want.
Hope that helps.