From the graffiti room, it will take us 30 minutes to return to Kobold Korners. If we allow for negotiating with NPCs a bit conservatively, figure an hour. That's leaves us with 80 minutes that we can use before we start to return. We've got this room to explore - each investigation of this room takes another ten minutes - and the western passage. The western passage, if it connects, likely has one room between us and the Grand Foyer. Do we feel like 80 minutes is enough time to explore that route, or should we just investigate the graffiti room a bit more and then head back?