Is slide transition time (automatic) set in 1/100 seconds?

Version (build 420m0) Impress running under Ubuntu Linux.
Attempting to set up a slide show with an automatic smooth fade at a 4 second interval I have found that the “Automatic after” time box is set in 1/100 of a second, not seconds as implied by the unit shown and expected in the Help.
I only found this by exporting the show to PowerPoint (sorry, it was my only alternative and belongs to someone else), setting the interval there and importing the .ppt file back.
The 4 second interval set in PowerPoint showed as 400sec in Impress (and works as required).
A decimal point is lacking, I think.
Is this a bug?