To speed up the matching in Duty Finder try to do as much as possible of the below:

1. Select all languages
2. Select Join party in progress
3. Try to do the most "needed" dungeons right after Duty Roulette timer reset (3 PM GMT, e.g. curently 17:00 CEST)
4. If possible pair up with someone on healer or tank class (can't join the DR like that though at the moment)