diff --git a/src/building/how-to-build-and-run.md b/src/building/how-to-build-and-run.md
index 0c96545c..af6123e1 100644
--- a/src/building/how-to-build-and-run.md
+++ b/src/building/how-to-build-and-run.md
@@ -251,4 +251,4 @@ everything up then you only need to run one command!
 ```
 
 `rm -rf build` works too, but then you have to rebuild LLVM, which can take
-a long time (on the order of a half-hour).
+a long time even on fast computers.