Depending on how you look at it, none and all of it.

The cycle of doing something the hard way, learning a short cut and then moving on to advanced material repeats all the way through college.

For example once I started taking Algebra, I stopped doing multiplication tables. College level math is the same way. After Ccalculus most engineers take differential equations. At that point I really stopped doing calculus and started relying on tools to do it for me.

In controls work we use a lot of Laplace transforms to define a system. While I technically know the full theory behind the Laplace transform, I haven't done one by hand in almost a decade.

So while I haven't 'used' calculus since my 3rd-4th years of university everything I learned during them required a fundamentals of calculus.

Depending on how you look at it, none and all of it.

The cycle of doing something the hard way, learning a short cut and then moving on to advanced material repeats all the way through college.

For example once I started taking Algebra, I stopped doing multiplication tables. College level math is the same way. After calculus most engineers take differential equations. At that point I really stopped doing calculus and started relying on tools to do it for me.

In controls work we use a lot of Laplace transforms to define a system. While I technically know the full theory behind the Laplace transform, I haven't done one by hand in almost a decade.

So while I haven't 'used' calculus since my 3rd-4th years of university everything I learned during them required a fundamentals of calculus.

Edit: An analogy of sorts. This is like asking someone on the 14th floor of a building how many times they use the 3rd floor. It may be never, but without the 3rd floor there wouldn't be a 14th floor either.