Since March 13th, Google Maps was not showing the time or distance to destination, in the driving directions for users of Firefox on a Mac.
A Google Groups thread has a historical look at the issue. I see that the first reports start on March 13th and then on March 14th Maps Guide Jen, said she will look into the issue.
About a day later it was fixed.
The issue seemed to only happen on Firefox for Mac and was likely just a rendering issue. Personally, not a major search deal at the moment, but I like to document these cases for later.
Forum discussion at Google Groups.