is it possible to sort by video length?

AFAIK no, unfortunately.

There's no such metatag listed on the searching cheatsheet, so not likely.

Would long_playtime suit your needs?

While not a perfect solution:

animated -type:swf -type:gif order:filesize

Will get you the biggest videos. File size is not equal to video length, but generally, longer videos will have larger file sizes.

Along with long_playtime (For any animations that are 30 seconds long or longer), there's also short_playtime (For any animations that are less than 30 seconds long) and 30_second_webm (For 'webm' animations that are exactly 30 seconds long).

HarryBenson said:
While not a perfect solution:

animated -type:swf -type:gif order:filesize

Will get you the biggest videos. File size is not equal to video length, but generally, longer videos will have larger file sizes.

Yeah, sadly because the filesize limit of the website is 100MB, most of the lenghtiest videos are pretty much almost that. On top of that, higher framerates and resolutions needs more bitrate, thus making files larger by default for same lenght, not to even talk about the cases where artists have brute forced quality by cranking up the bitrate meter to the max.

So generally, not ideal. You do definitely most likely get lengthy videos with that, but at the same time you could use long_playtime and use other sorting modifiers instead like order:mpixels.

D.D.M. said:
Along with long_playtime (For any animations that are 30 seconds long or longer), there's also short_playtime (For any animations that are less than 30 seconds long) and 30_second_webm (For 'webm' animations that are exactly 30 seconds long).

I was actually discussing about this with one user the other day and realized that the 30_second_webm is still somehow a tag.
That tag is straight up dum and should not exsist.

Also glad that after year <30_second_webm → short_playtime alias was approved.

There is also loop for content that loops, technically having infinite playtime.

This could make a good new metatag for searches. Feature request?