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Ok, now full reply:)

At first, GC MAY blocks all threads, and for me (Win7, Java 6, default settings) it DOES it, because, for example in battles between Tomcat and Scarlet in late rounds game periodically freezes for seconds...

For robocode milliseconds is completly useless, but my experience shows, that nanoseconds is fairly usefull and i did find out with them some ways to decrease skipped turns amount.

Maybe there is a sense to add some kind of protection against invalid values, for example, discard values larger that 10 ms or larger than mean value more than 10 times