Sorry I was confused between your experience and the opening post which was moving from Scala to GO. So I assumed you were working for Movio and used their numbers. Therefore my post does not make any sense :)

Then it was a Java to GO move. I wonder where your compiles take the most time. For our work building the jar files are the most expensive part. Javac is about 20 seconds all in for about 3000 files to compile on my 2009 macbook.