Less than 7 it is I'm afraid.
But I have to ask, why would you work and establish a democracy somewhere and then work a different faction in another system into expansion? Why are you playing with 2 Minor Fac's?
And Expansion can last 7 days. At least it used to be able to.
I am actually playing with several democratic factions in various systems within 20 Ly of my "home" system (plus a couple of significant other systems). My thinking is this:
If someone can easily cripple one faction across systems by causing all of the same faction to suffer a State, then it might be much better to have many factions, all independent, so that any would be invader (say a certain Power) would have to tackle them all separately. Democratic factions all have Elections rather than Civil Wars, so at least competitions between them would be semi-peaceful (pseudo-role play consideration) - hence all democratic factions are effectively the same type of government. I am interested in the government type, not the party of the day.
I also play with some others who seem more interested in getting into scraps than anything else. I fly an Asp, so I can create Civil Wars fairly quickly - so that's my job. I also want to put a faction type that is unhappiness for a certain Power in it's path. If I can show it crippling CC/Wk, then maybe, just maybe, I can discourage it from heading my way (5th Column sorts are a bit of a concern, but you can't have it all). If a bubble is plopped on top of me, the negative CC/Wk may just encourage the Power to let it go as quickly as possible.
I might be wrong about some of this, but I'm just learning and it is quite a bit of fun.
Also, I'm kind of in a hurry here. I am in harm's way. It is only a matter of time...
...
ETA: Day 7 now and still no expansion. :S