Hi,
I also get good results by using a small 12v float battery charger which does not overcharge the battery. First, I let the traction battery charged to green-bar level and then I connected the float battery charger to the 12v battery. After two and a half months, the traction battery charge level was still at green-bar level and the car started right away. At this rate, I think I can leave the car in the garage for at least three months or more without driving it.

I just came back from a two week vacation and the car was fine. Don't worry, be happy.

Mine has sat for a bit over 3 weeks while I was on vacation and started up just fine. The traction battery SOC didn't change at all from sitting. I think the 12V battery is more likely to run down from sitting than the traction battery.