It goes to sleep after 4 days and you have to set the wake up for a specific day within 2 days of using the car.

It's a bit rubbish, but fortunately I use mine daily and only have to set wake up when I go on holiday. RRS MY17 SDV6 AB
Evoque MY17 TD4 AB

If I had a separate fob for the park heating I assume I could use it anytime even if the car was asleep? I had a separate fob for my old shape RRS and her had an issue with it not working due to the car been asleep.