Skipped Turns

The permitted amount of time per tic for a robot is given by "cpuConstant" (see the source). On a modern computer it is about 5 -- 6 mS. You can check/recalculate it via the menu in GUI, see under options. It is reported in nano seconds.

If you want to time your bot, I would recomment to use nanoTime() call for profiling.
You can see how a bit more fancy profiling done via a special class at 
[[https://github.com/evgmik/robocode_bots.frame-lib/blob/master/misc/profiler.java]]
I am using it in [[EvBotNG]]. If you  look at console, you will see profiler info at the end of every round.