Lack of contact with wife

My wife is overseas (We had an arranged marriage) i talk to her to about 15 mins during the day because of the time difference its hard to talk as when i finish work its 11 for her and too late. After reading some of the posts here i am worried whether this is going to be enough or if the immigration office will question why we don't spend more time talking on the phone

If you talk every day and have phone records to prove it, I don't think you have a problem in this area. Many people contact one another less frequently.