I concur, that's pretty quick for that amount of lines... liney stuff, you know what I mean. Looking at it, though, guess it's a lot of hatching, a lot of surface finish stuff on an otherwise pretty simple drawing. So I don't feel quite as bad about fussing with an ink sketchbook picture for 4 to 5 hours.
How many flippin' V5's did it take you to do all that? I too used to be a big fan of the Pilot V series of pens, until Faber-Castell PITT Artist pens came around. I still whip out the V5's and V7's on occasion for hatch work, just because I like the action on the V series better... trails on and back off the page a bit prettier than the PITTs are capable of doing. Unfortunately, though, all my V's are all dried up and crusty from lack of use now.