With my husband, from the very beginning of our relationship (first date), not a day has gone by in the last 4.5 years without us speaking to each other at least once... usually many more times than that... no matter how far apart we were.
The sole exception to this was when I was forced to be incommunicado when I was doing fieldwork in the African bush (rural Zambia) for 2 months. I had no access to any phone, internet, or postal mail for 3 weeks at a time. But, in our own way, we still contacted each other every day... I kept a journal in which I wrote letters to him each day (and sent the whole book to him when I was finished), and he wrote me e-mails each day, all of which I read in one sitting when I got back to an urban area.
As for parents, it averages out to about once a week, and grandparents more like once a month (I only have one left now). Aunts and uncles, it varies... depending on how much I like them or not. The ones I don't like so much, we never talk. I probably talk more with my cousins than anyone else, since we're constantly online and connected in that way. Funny, I actually talk with my 3 best friends least often (because they're furthest away right now, and they are not technologically adept)... once every few months, maybe. And my next-best group of friends are all on Facebook, so that's at least once a week.