Zero.
It doesn't stain, it doesn't absorb, it's hard to crack (heat). It's sanitary, because it doesn't absorb juices (to use the polite term) from food. It feels soft (lots of talc), but if a scratch bothers you, you can sand it out. They have greenish, grey, and/or white veins.
If you want, you can oil it with food-grade mineral oil. Soapstone starts out as a pale grey, but it oxidizes with time to a charcoal, almost black. Applying mineral oil once a month or so speeds that up, but you don't have to do it unless you want to see the color change. Soapstone doesn't have to be sealed, resealed, etc. Back in the day, it was used in chemistry labs, including high-school chemistry classes. If I couldn't hurt it back in 10th grade chemistry, it must be pretty tough! I love them. There's something about them, with their depth, and you just want to touch them.
This was from our previous house, freshly oiled lol. They were either leathered or honed, I can't remember:
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