my question is, what is the difference to the event, why a player has to escape flight out of event time for longer times?
Difference is that players doesn't have anything to do between events. They can't do anything so they go for month escape flight.
yes, i see your point that escape flights is a part of activity, shorter flights means more "forced" activity.
What you don't see is the point that palyers leave because they have to play.
In vacation mode research is stopped, buildings are stopped, anything is stopped (beside these 25% production) ... so, its a given method (still also in si classic) that you can have long-term-escape flights.
If we change that and forcing these players to play, im not sure if they are just going blue - and you don't get the production anymore.. i think this isnt a good idea, but we can give this a try - will talk with the team about this.
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Oh so you just feel like player that is in the game once in month is playing. If player would be 'forced' to log in once in week and because of this, he quits the game then I think you are lying to yourself that he is still playing game.
Maybe you want they create some fake crowd in game. But then why vaccation mode even exists? If player can just go for month escape flight, and it got more benefits then vacc mode maybe just delete vacc mode?
I see this as Dschibait, for me in Retro it is a bad idea. Sometimes I need simply to break the game for some weeks. Now I can do a few weeks long escape flight and the reasearch, which is mostly a few hundred days, continues. Otherwise my research time would be not for example not 360 days but about 400-450 days. That is unacceptable for me.
If you need to break game for some weeks then you have vaccation mode. If you are not playing for weeks why you deserve to have same benefits as active player who is in the game every day?
Shortening the flight time brings nothing but possibly more players who quit because they have lost their fleet. Which is one of the reasons why players leave SI. I can just as well fly a recycling flight or a colonisation over 4 weeks.
If you want to destroy fleets, you have the aliens.
In fact, it will make a big difference if players who log in once a month leave the game altogether. And you cant fly recycling flight cause it takes only recyclers. Colonisation also would be problem, but I can see that flight through whole universe takes about 30 hours for colony ship (at 100% speed). So that limit (3 days for one way flight) wouldn't really affect real colonizing flights. I'm not sure what's the reason you want lie to yourself that this players are playing, if they log in once per month they left the game already 
Guys it's really simple thing, if you give players benefits for not playing and you won't give them benefits for playing they will just stop playing the game. Cause right know I'm starting to think, why I should even log in every day? Maybe I will also just go for month escape flight, I don't get too much profits for beeing active anyway. And if I will play game once a month then why I play it at all? Stop giving players benefits for not playing your game.....