There is indeed a timer function, infinitely programmable for time, duration and temperature.
The last word in cali comfort is pulling up into a britstop, having a nice cup of tea, getting all glammed up, stepping out into the cold, frosty, night air, tripping over for dinner and a few glasses of wine, then with perfect timing returning to a van when the heating has turned itself on ten minutes earlier.
Sheer bliss.