Fixed my wording

Build-Environment-Setup.md

@@ -40,8 +40,7 @@ If you're using [homebrew,](http://brew.sh/) you can use the following commands:
     brew install avr-libc
     brew install dfu-programmer
 
-This is the recommended method. If you don't have homebrew, [install it!](http://brew.sh/) It's very much worth it for anyone who works in the command line. 
+This is the recommended method. If you don't have homebrew, [install it!](http://brew.sh/) It's very much worth it for anyone who works in the command line. Note that the `make` and `make install` portion during the homebrew installation of avr-libc can take over 20 minutes and exhibit high CPU usage.
-Note: The `make` and `make install` during the homebrew installation of avr-libc can take 15+ minutes for each and exhibit high CPU usage.
 
 You can also try these instructions: