5 minutes!!!
Dang... Ok. I have to time it at some point at see if I can make that. We're talking about the whole round trip of it with picking up mission, leaving, going there, dropping off, going back, landing, and ready to pick up new missions.
I assume that you had only one jump and not multiple, or just between station and a land post or something.
Exactly my point. I made the calc with the premise that we don't stack. The only way to get it done faster is if you can stack. Now the problem with stacking is that in the long term, a couple of weeks grinding, the station will go through famine, war, and such, and some missions are not produced as much or often. There were times when I did this kind'a grind, and I had to wait for much longer than 10 minutes to even get enough missions to stack.
--edit
So I did a delivery mission of "slaves for fun". It was two hops. Receiving station was 2,000 ls out. It took 7 minutes. So I think you're right that one direction can be done in 5 minutes if it's only one hop. But now going back will undoubtedly take a few minutes, so getting there and going back in 5 minutes, even in one hop, and consistently so it can be the average, I'm not so sure about. Because, what you're saying then is 5 minutes. 20 missions each time. Then you have the next rank in one hour. In other words, you can make to admiral in one day. I'm not sure what I'm doing wrong...
--edit2
Now I'm doing a delivery mission to a station that's 20,000 ls out. I'm still flying there. More than 5 minutes already. How do you do it? How can you get there that fast?
I'm not talking about single hop missions. I spend about 10 minutes to get half dozen missions to 1 or 2 hop destinations. I go to the first station at 1 hop in 5 minutes. I usually limit missions to 2000LS destinations. From that 1st station, I pick up half dozen missions to the same set of destinations. At the 2nd destination 1 stop away, I take half dozen missions to the same destinations. And so on. Before long, I'm completing several missions at each single hop with some missions that eventually take me back to the original station so that I don't incur a wasted return trip without missions to complete at the beginning station. In short, take missions withhold a short radius from a central system. Pick the right central system where the surrounding systems have stations close to the star and you can get a good momentum going, especially if one or more of the factions are giving donation missions, like Taribes was doing.