Dungeon???

This is what I want to ask:

Case 1: When i play solo in a Dungeon, it will take how long the Dungeon will be refreshed. How many times a day can I farm in the Dungeon?

Case 2: And if "Join Party" is how long the Dungeon will be refreshed. How many times a day can they farm in the Dungeon?

I hope to hear from anybody. Thank so much.