It depends which is met 1st miles or time?
My old golf was put on a longlife service plan, after i did 10k in the first 6 months they did a mini service. Then it was 2 years or 20k miles, not one year or 10k. I did ring Mb and they said yep that was the case. So i called them when it was almost near 30k and I was about to drive across europe and back and they serviced it. The service manual might tell you, but not all cars have them thesedays.
if you don’t do the miles the dealer prob will contact you like they do for the final mot 3 months before the lease should end.