I saw a Reavers LFM a few days ago on Sarlona.

Level 17-20

When I first see the LFM, most of the slots are open and it reads "NEED THREE HEALERS AND TANK"

Ten minutes later its still up they have 11 spots filled (including 2 clerics) and the LFM now reads "NEED HEALER THEN WE GO"

It stayed like that for another 10 minutes or so.