It's the same with mine except that I've not kept track of how long it takes to loose a minute... but I guess it's around that, a week a minute. Yes. It's my daily driver and I drive a lot. No sign of bad battery from my recent service, in fact it was "green".The clock on my 2017 HSE Dynamic is really slow. And I think getting worse. It's loosing about a minute a week. Anyone else experiencing this? (I'm on ICTP 18C).