Because mine is a helper/nanny she has to look after 3 kids she doesn't get a lot of time to herself during the day and works long hours. So I normally wake up to messages on facebook which I reply to over breakfast. She will than reply as and when she can. If she gets time during the day we normally chat on WhatsApp. Then normally mid afternoon here in the UK we will video chat on Skype.
When I'm working (not allowed mobiles at work) She will normally wake up at 3am Her time and we will Skype for a while until she has to get up to get the kids ready.
Hard work but well worth it if you are willing to be patient.