It's hard. We have a 11hr plane trip to visit them (I'm in USA, they are dotted around Scandinavia/Northern Europe mainly) at the most, 8hrs least.
There's no real support. I never realised how little we saw each other after I made a list of holidays we could take (I moved with my company, along with my family of course, and they give us one return plane flight each year, so I'm lucky). When I used to live in Sweden, even in Stockholm I was about 4hrs drive a way tbf, but when I lived close by, I could visit them, pop round, talk to them. Now, I say that I get to see my family regularly- twice a year, us going to them, once a year, they going to us, and then we Skype, call, email and Facebook.
However, can I say that the time you DO spend with them will probably have more meaning. Before, I'd pop over regularly- and when I moved down to Stockholm, maybe once a month trips from each of us. Moving to the UK (only for 6mnths) we saw each other three times, for a week each. Now, they come for about 4-5wks in summer (luckily they're retired, so have a lot of time) and we go for either 2wks at Christmas OR 2wks at Easter. And when we're they're, or they're here, we do a lot of stuff. Last time we went, I worked out we did an average of 2.5 activities per day (kayaking, swimming, cinema, different camping activities, canoeing, rafting, going to a zoo etc;) There's less time to spend, but we spend every single moment with each other and enjoying each other- and we value the time even more, and use it even more- which didn't happen before.
My step-dad/his wife (they've been my parents since I was a kid- so imagine them as bio parents for a min) are used to visiting random step-kids or DC in other countries tbf (one brother in Oman, another Brazil, half-brother AND my sister in Australia etc;), so they know to value time, but that is something everyone learns. Usually we relax and just enjoy ourselves the first times, savour being with them again, and then we set out to have the best time ever in just a fortnight or something. Honestly, I've loved them and had more fun with them in the past years I've lived in the USA then when I popped around for 5mins three times a week or something.