Even though I'm very much interested in the idea of a long distance relationship on a galactic level based on its story potential and potential for character (family) growth for all parties involved, I'm personally not comfortable with proclaiming that it'll be all the more sweeter and more impacting if the time away is elongated. At this juncture I can't say one way or the other how justified a prolonged separation will be narratively speaking.
A level of autonomy for Lois and Jon would be very nice. Them making a choice to stay away longer or them finding causes while their that keep them away. And if that's not the case then a credible external reason for them not to return needs to be in play, and that can't be a "whoops, just missed em" sort of Benny Hill, Yakety Sax, hall of revolving Scooby Doo doors situation. That'd betrays what is turning into a sprawling and well planed out plot so far in Man of Steel.
Bendis is playing at this galactic political thriller angle in the backdrop of his story, so I assume he'll lean on that to facilitate any prolonged absence by Lois and Jon. The crazy man with the axe is taken care of, but what about the people more or less complacent in his actions? A sort of intergalactic witness protection, but in this case Clark and his family can't trust the space cops because they're potentially dirty even without knowing it (I don't think it's a mistake Bendis is using Hal as the concerned friend looking out for Clark). But from that point on, I'd need Lois and Jon to be actively doing something of their own while away, and I'd very much need Bendis to make good on the promise of the Kents adapting to what their family needs to be. I'd also very much appreciate issues/moments where visits happens.
But as it stands, I'm very much okay with Bendis unraveling the plot before me, and I'll make my judgment on how long this could go before it insults my intelligence.