I didn't drive my car for a little over 5 weeks at the beginning of the year and had no issues at all when I got back. The only thing I did before I went away was put on the car cover and turn on the APR engine immobiliser feature so my sister who was house sitting wouldn't touch it. I remember reading in the manual that after two weeks of not being driven, certain features shut off to conserve battery power. Not sure if there's anything like that for the newer models.
Cheers,
Trent