BJR (((hug))) for you and we are here for you with a listening ear and a virtual
anytime you feel like talking (or not).
mopsy oof that's hard. What does your DH think? I have to say if it was me, I would probably take the job and put off baby #2 by 5 months unless DH had some really good arguments to talk me out of it. I know how competitive academia is and how you have to grab every opportunity with both hands if you want to keep climbing the ladder.
On the missing/adjustment point, at the moment I am working three days a week - I put DS to bed on Monday night and he doesn't see me awake again until Friday morning. (I know I'm leaving my job but my problem is mainly the 3 hours of commuting and the ridiculous presenteeism expected in the City, not just the time away from DS IYSWIM). He seems totally adjusted and it's lovely to bring him into our bed on Friday mornings and have a lovely catch-up cuddle and then a stretch of four days together. We do have a nanny for those three days that he's comfortable with and next year we'll have an au pair covering the nanny's mat leave.
On the DH front, over the last 6 weeks we have been going 6 days at a stretch like ships passing in the night where I come in after he's asleep, or he comes in after I'm asleep. But we email lots during the day which is actually really nice to actually get words down on paper and keep in touch with each other. Also we have the end of term as a sort of deadline where we will then have the easter holiday to decompress and reconnect as a family.
Over the years my parents have regularly spent up to 6 months apart and keep in touch eating meals together over Skype - they sit down properly and eat and chat just like they're at the table in real life, which I think is a brilliant idea (usually they're 5 hours out of synch so my dad is eating a late lunch and my mother is eating an early-ish dinner). Also if they're just sort of sitting around on a weekend working or cooking or something, they'll just leave each other up on Skype for hours so they're just kind of there to chat to occasionally. Sometimes I'll go to the boat and my mother will be working and my dad on the screen reading the newspaper in DC and just look up and say hello as I walk in, as if he's in the room, and I'll see that they've had Skype going for 4 hours or something.
I think if the separation period has a finite end, and you're coming home for 4 days out of every 7 including every weekend, you can make it work with some thought and planning behind it.
It's a really hard decision though. Is there anything else on the horizon that you're waiting to hear back about, post-docs or the like?