From Caimie Tsukino's Guide: If you're on a PC, press "Ctrl U" on your keyboard to open this panel. You can then scroll down, and check the "Rowena's House of Splendors".

There. you will see what can be turned in fo red scrip. There will always be Adamantite Ore, plus a random material (like Sun Mica) from a Legendary node that may be different each day, and, new for new 3.1, a material that delivers far less red scrip but is available at all times. Look in your gathering logs for the area that last mat is in.

Caimie's guide also has the times that the timed nodes spawn.