No, macros run at compile time (cf https://www.lispworks.com/documentation/HyperSpec/Body/03_bb...), you may be confusing macros and reader macros.

Fair that I was definitely mixing them in my thinking. My general point was supposed to be simply that "compile time" is probably not what people are thinking of when coming from other languages. I was clearly a bit too eager to try and say that, though. :(