I don´t see a problem with this taking 5mins longer in Unity, as you can save that time at other places when using Unity. Like for example when publishing the same project for Mac and iPhone and not only PC...

Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en)
Shader Tutorial (ger)

http://www.slindev.com