If you want to be a line cook at Chipotle all they really care about is if you show up, learn the skills, and do your job correctly. Then you boop in, boop out, and can do literally anything once you boop out. It won't affect your current line cook gig.

Car sales is an all encompassing job. You never clock out. You might decide that stop working, but you could work all day everyday if you wanted to.

And in the first 2 years of selling, if you plan not to get fired, your will cram as much time into it as possible. There is no casual mode. You could coast a bit after 5-7 years, but particularly in those first 2, holy shit.

In short you only get into selling cars if you want to sell cars. Spending two years getting up to speed to bounce is about as stupid as you can be. It's like building a house and then not living in it.