This is not my claim. My claim is the departure times are a much more significant issue.
I disagree with that timeframe, even for clean/ no alarm missions. That said, individual times aren't a good measure, you have to average it... otherwise do we mark off the person who takes an hour to do this. You claim 20, i claim 10. 15 is the baseline I'm using in that case.
... and moving between space based objectives is very stick. But number of activities is not the measure here. Time actively playing the game is.
You also need to compare like with like... megaship missions, hijacks, massacres, they're much more involved as well. (And then there's the wrinkles)
If, in another world, space individual space missions to the same length of time as an Odyssey mission, the time idle still wouldn't change; moving between activities in space is dramatically faster than moving between Odyssey activities... as such drastically more time is spent idle in odyssey as a proportion of play time, because of how long it takes to leave a planet's gravity well and reach a decent supercruise speed.