How long would it take you to do a visual design mockup of a dashboard (one-page) in say photoshop? This does not include any research related to it. Would you spend one day or more like a week? I am curious of how others estimate time and what is expended in the industry.
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What do you mean by no research? So you already have the wireframes and navigation thought out?
1 week seems really long for just a dashboard. Assuming you already know what direction you want to take it (in terms of color scheme, layout, and typography), I wouldn't spend more than a day. If you have to detail all the interactions for the dashboard, then that would obviously take longer. How long? It depends how complex your dashboard is.