Depending on the type of shots I choose to include in my page (like background-heavy, or character-heavy), it can take me between 1 and 2 days. My comic is full-color digital paintings.
Condensed time:
Sketch pass - depends on the point in the story, but on average about 1 hour.
Per-panel - minimum 15 minutes, with an average of 45 minutes.
Per-page (8-10 panels) - 5 hours.
fully illustrated background panel - 1 to 4 hours.
I get distracted, and I also have a part time job, so I tend to stretch out my work time to fill 2 weeks (unfortunately). If I were to shut out every distraction on my day off, I could probably finish a fully illustrated page in 5 to 6 hours.