Long time ago, there was a search page that provided a few release related fields like name, and duration formatted as mm:ss.
I really miss this. The only way I can figure out to do this using an Indexed Search is to convert mm:ss to milliseconds, which is a pain as well as overly precise, and then to structure a query “name-of-song duration:nnnnnnnn”.
Would be a lot easier if there was a quick search page with “fill in the blanks” for a few commonly used fields like release, album, artist, duration, date-range, comment, number-of-tracks.
And BTW, it looks like support for times is weak, as the Indexed Search Syntax help page explicitly notes that you can’t search for albums by track length…
Search - MusicBrainz you mean? Granted, it doesn’t do mm:ss, but this page has been there for probably about 10 years by now (that is, I can’t remember it being there, and I’ve been around for 10 years soon ), with (too?) little change. (I’m sure Chirlu or someone will quickly dig into the Git history and show me how wrong I am, but eh. )
You also can’t search for Artists using Recording durations, or Labels etc. If you want a specific Recording (or Track), you can use dur and search Recordings. I do think it would maybe make sense to add something for Release length though, but not for looking up a Release based on the dur of a single Recording/Track that happens to be on it.
), with (too?) little change. (I’m sure Chirlu or someone will quickly dig into the Git history and show me how wrong I am, but eh. 
)