ETA shows garbage like 4043:242618:08

When I run a simulation which sets max number of steps, the UI shows garbage ETA (estimated time of arrival), as shown in the attachment. The script is fairly large, so I can't isolate MWE, but I guess it will apply to any simulation setting the number of steps beforehand. Cheers, v.

Original bug report by Václav Šmilauer on 2016-02-10 : https://bugs.launchpad.net/yade/+bug/1544022