How many days can the third-generation classic Haval H6 be left unused before the battery runs out?

I drive every day and it's still at 45%.

It ignites instantly, within just 15 days.

If you don't drive much, don't buy a car. You'll just be worrying about the battery all the time. Don't you have enough on your mind already?

I left it for half a year without any issues, didn't use the auto start-stop, and there was no other power consumption.

It's normal to experience losses every day, some faster than others! More features mean faster battery drain, that's just how it is!