Last Visit™ allows you to set the default number of members listed on each page of the main results list and the order of which they are sorted.

If the list is sorted ascending (ASC), the list is sorted to display the lowest point first, either alphabetically or numerically, with A being and 0 being lowest.
If the list is sorted descending (DESC), the list is sorted to display the highest point first, either alphabetically or numerically, with Z and infinity being highest.

In the example below, Last Visit™ is set to display 100 members per page sorted by the last login date descending from the most recent.
The last login date is calculated by the numeric Unix timestamp, so this means it is sorted by number instead of letter.
The closer the timestamp is to the present time, the higher the timestamp number is. So, the most recent visitor would have the highest timestamp and therefor would be listed first when sorted descending.