I have 2 frames with sorting set to time descending in the layout tab.
Frame 1 is a whitelist for buffs and uses the filter r>=30
Frame 2 is a whitelist for buffs and uses the filter r<30
Normally the sorting will have the buff with the highest amount of time left first and then descending from there.
But when using the r filter, sorting is changed to time ascending.
I can see SBF use the time descending option if I get a new buff, but after 1 sec. it changes to time ascending sorting again.