Can I wait more than 6 months between two sessions laser hair removal treatment?

Your results will probably be minimal if you have treatments spaced out that far apart. I would wait until you are able to stay in one area and have a consistent set of treatments (4-6) about 4-6 weeks apart. 

It would be best if you could be consistent. While some treatments are ok with more time in between, hair removal needs to target specific periods of growth. Yes, you can do them sporadically and get results each time, but just know that you will probably need to do more treatments overall this way because of the inconsistency with timing. "This answer has been solicited without seeing this patient and
cannot be held as true medical advice, but only opinion. Seek in-person
treatment with a trained medical professional for appropriate care."