I assume you are asking about total time not just turning, sanding and finish time. I would say it normally take me longer to just get blanks ready to turn than to just turn them. (or it seems that way)
When I go to do several pens (of the same species) I do an assembly line kinda thing: I go ahead and mark/measure and cut blanks. I then take all the brass tubes and sand them down. I do this with a 2" sanding sleeve on my drill press. I then drill all the blanks at the drill press. Then glue (CA) the brass tubes in the blanks. Then I trim the barrels at the Drill press.
Let's same I'm doing Euro's, I will often have different platings and different blanks. I then go back and make sure each blank matches the right kit that I had predetermined before I got started.
That total time for about 7 of those would be around 45 minutes to an hour.
Then it takes me about 15-20 minutes each to from turning to finish.
Then what I do is put the barrels back in with the kit. After they are all done.... and my hands have been washed, I take them to the pen press and put them together.... let's say 5 minutes each.
So when I average that all out 7 pens would take about: 3.5 -4 hours.
Now having all that said and some folks think I'm slow. I don't work so hard as if I have a task master on my behind drilling to get more production from me. I keep the T.V. on and listen to History Channel or something... sometime talk radio or just music. So I am enjoying my time in the shop. I also take a bit of time to relax if my knee or backs starts to bother me since I'm standing in one place for a period of time.
Now what I will also do... If I have a few pen kits of the same time and I'm not in a hurry for them. I'll do all the 'blank' making. (No turning involved) and put them aside and I'll do one here and there through the week when I only have time to turn just one or two pens. I find that works best and suddenly I've got a bunch of pens done for an event or holiday. I don't sell week to week so I don't need to keep a large inventory at hand all the time.