So how many hours play would that be? Divide by two and thats the hours per week that you have to play just to maintain your status - after which you can do your own thing.
In my case I manage 4-6 hours per weekend (or less). I might get a couple of percent onto my reputation in this time - as I tend to have fun doing a range of things rather than grind (which I view as failed gameplay [1]).
[1] spoken as one who made 25,000 individual leather helmets in one MMORPG to level up once... and never again.
I haven't played much lately because I've been in the hospital. I'm still allied to the Empire.
My rep with the feds had gone down to friendly a few weeks ago. I got it up in a few hours of gameplay, without even trying.
Don't focus too much on the Faction rep. Being friendly with them is just fine.
If you can only manage playing 4 hours per week then of course it might be a bit more difficult for you to maintain allied status, but so what.
That simply is a fact of life. Try not to fret about it. It won't really hurt your gameplay.
If you do not engage in hostile actions your rep will stay at the upper range of friendly.
FD can't build the game mechanics around your personal gameplay habits. I think the rep decay is very mellow as it is.
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It's a flawed mechanic to be honest I can see a reason why they won't recognise you after x days/weeks at the rank you was. I think failed mission should affect your rating not absence.
Why should failing a mission affect your faction status?
Failing missions doesn't eventually turn you in an enemy.
I can imagine it affecting your military status though.