I can confirm that this bug is triggered when the tracklist has no length for a track, but the linked recording has one.
I'll move my previous comment to a separate ticket.

I noticed this, too... I thought the track times come from the recordings, which shouldn't be. Recording times should not automatically get transfered to the tracklist.

This may be related to MBS-3607 - but not really sure

This was explicitly requested in MBS-3355, I have no strong opinion either way.. but I cannot act on conflicting tickets. Please discuss this in the weekly developer meeting or on the mb-users mailinglist. Depending on the outcome of such discussion, either close this ticket or assign it back to me when there is enough consensus on NOT automatically setting track times.

I will start a thread on the musicbrainz-users list and also attend the next dev meeting. I'm sorry that I didn't notice MBS-3355 before it got fixed.

I have multiple albums in my TODO collection that need to be fixed (errors in tracklists), but I can't do it because that would add track timings that I haven't verified.

In my opinion durations should only automatically float in this direction:
tracklists -> recordings
never the other way round.

It is also not at all a bad thing to have vinyl singles without track timings set. I would consider it quite normal for vinyl releases.

Kuno, I actually don't think this conflicts with what Paul wanted. We could have a way of sourcing the track times from recordings; it just shouldn't do it without asking and as part of a different edit by an editor who isn't trying to do that.

Hi hrglgrmpf, I re-assign this ticket to you, just in case you know how to manage (I don't).
If you're as little used to that sort of things as me, just re-open the ticket unassigned, maybe.

It was decided in the dev meeting to add a checkbox. I see how difficult it is to create a patch, if it turns out too much work for me, I'll assign it to warp!

A quickly wrote a patch, see http://codereview.musicbrainz.org/r/1617/