Even if it mutates, and/or even if
@SaintRob is correct in his post below yours (3 months to 3 years), when it comes back, you will still have some antibody response and will fight it better the 2nd time than the first. So it's extraordinarily unlikely that you'll die from it the 2nd time you get it down the road, unless you've developed some other underlying condition in between the two.
So yeah, you could get it twice and it would probably suck the 2nd time too. But I think most people are fine with that, they just don't want to die. You won't die the 2nd time you get Coronavirus if you survive the 1st.