Is there a desirable clip length?

I do animations and I'm wondering if there's a desireable clip length. I usually do 30 seconds but I'm wondering if that's too long and if 15 seconds would be better.

I'm trying to get back into footage any insight would be appreciated.

Anita

A clip I recently sold Appears on Americas Book Of Secrets Intro... and at the best was 3sec, maybe even 2sec.
Blink of an eye.
But a great question ....WHAT IS THE BEST LENGTH ?

I usually edit for at least 10-20 seconds but will go to 30 if there is enough interesting content.
You have to look at the different scenes in TV commercials. A clip may stay on for 2 to 4 seconds. Although I did see them use about 8 seconds of one of my clips in a commercial but I'm sure that is out of the ordinary.

So, you have to give them enough to edit with. The 3 seconds I like in one of my clips may not be what the editor likes.

15-20s

Is too long a bad thing? In one case I can think of if they want a snippet of 2 seconds, but don't want to download all 20 or 30? I have some clips that are 59 seconds (like driving plates or boats incoming). Is it better to divvy these up into 20 smaller 15 second clips with a few frames of overlap?

Sell a 30 sec and they get many 2 second clips.
Sell them a 10sec and they have to come back to buy :)

Yes....good point. Also thought there is the problem of having "too many" similar clips, especially if they are similarly named and keyworded.

Or they look at your 10 second clip and move on because there isn't enough in the clip for them to get what they want.
I agree 30-60 seconds is too much. We're not selling short films.
But too little may make them move to someone else's clip.

I don't think there is a problem with shooting something similar if its a different camera angle or something like that.

I used to make quite a few longer clips, but now because I'm also uploading to RS, I limit it to 30 seconds. Optimum seems to be for me to be 15-20. Here's an example the end of a series coverage of an event, mostly in 29-second clips that offers many different camera angles/compositions/events, yet can be reassembled into one event (see linked clips in description)....is this reasonable? https://www.pond5.com/stock-footage/10785875

15-20 seconds is my norm. I have had some that really needed up to 35 seconds. RS doesn't get them since the limit is 30 seconds. For 99.9% I believe 20 seconds is long enough. Any longer the subject may be questionable for stock.