They all are completion time estimates, usually, if there is urgent requests like wedding cake the clients need to take advance note to send them and as it's a large city there are copper-ranked adventurers who likely take the quest sooner or later. You're not the only adventurers in a city this large after all; the quest board is just present right now situation. It may have some quests missing after an hour or two or maybe three new ones.<br/><br/>Anyways reminder, you did pay 100gp for Duncan for an hour of lecture on Living Dungeons so keep that in mind while thinking about quests or taking them.