When I viewed the car almost 2 years ago they had to jump start it. Knowing (from here) about the battery drain issue, I told them to fix it, so they replaced the battery. So that's just under 2 years old.
The only time it's failed to start was after around a week stay in hospital. The car was parked in my mother's neighbours driveway. Normally at my home I have to park so far away, the key issue isn't a problem. I presume at my mum's the key was near their front door, so that's why it drained. I did for the first year place the keys in a Faraday pouch, but got out of the habit of doing so, because I normally park so far away.
I mentioned what had happened to the service team, they checked the battery and said it needed recharging, so they did that overnight.
So we'll see what happens.