I could agree with you only in case the game will provide many more option to help with selections, visualizations, and so on.
I mean, if in Aircraft page, in routes page, in scheduling a lot of different searches would be possible then time to manage could decrease and yes day could be only 25 mins, but with the tools available, when the fleet grows you need more time handle it.
From the other side I will push for many more scenarios, not 20, but for sure more than 4 whit different leghts so it is far easier to select the beloved one. Just making examples, but, regional, some with maximum let's say 100 players, some with different period available, and we could go on ...
But this is just an idea!