A quick line sketch: 1 hour, w/ color/inking: 2
Detailed work: 10-16 hours
And then I've tried a more intricate piece that I spent about 20 hours on, though I didn't end up getting shading or other effects done and some of my old photo-realism pencil pieces took upwards of 30+

I don't get as much done in a given time span as I would like, but I'm pretty sure that's because my practice is rather sporadic and prone to long gaps which I'm trying to address