That is completely up to you and your comfort level. Personally, I usually text my mom or dad at least once a day, or they will text or call me, but you can talk to your family as often as you'd like. Everyone else is pretty much in the same position you are, so nobody will say anything if you call home a lot because you miss your family. It's completely up to you and what you want to do. If you want to call home every hour, go for it!! If you're enjoying your new freedom and only want to call once a day or once every two days, go for it! (If your parents will let you :P)
I don't think that really matters. Call home when you want to or when other want you to. It really depends on your family and you. Do what you feel. When I was studying abroad, I had a weekly skype chat with my parents and that's it.
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