FitNesse. UserGuide.
TimedActionFixture [add child]

Seeing How Long ActionFixture Actions Take: TimedActionFixture

You can used TimedActionFixture if you want to see visual feedback on how long certain functions take to execute.

start fitnesse.fixtures.DelayedCountFixture
check counter 0
press count
check counter 1
press count
check counter 2
enter counter 5
press count
check counter 6

The DelayedCountFixture used above simply adds a random delay to the count function.

The TimedActionFixture does not report any delays that are less than one second. I don't know why Ward decided to impose this lower limit. Perhaps he'll remove it one day.

This fixture does not appear to give you access to the time or the split. It just displays them for your edification.

For more on ActionFixture see: DesigningWithActionFixture.