Now that I reached level 55, I have been trying out the new mission - The Local Mini Tour Support, for pretty much the whole of yesterday.
Like earlier long missions, it takes up 100% of your energy but it also takes longer to complete, at 5 hours. By the time the mission is complete, the power would have been re-filled back to 60%.
So how has it been in terms of earnings? Unfortunately, so far most earnings have been closer to the lower bound.
753 starbits, 1507 starbits, 1460 starbits and 855 starbits. None near the theoretical upper bound of 3000 starbits. But I'm sure that sooner or later, the upper bound results will start rolling in.
What is less clear is how to reach level 75 any time soon. It will take 3-4 days to move up a level at this rate. With 20 levels to work through, that will take roughly 3 months.