With audio clips of sound effects, usually the shorter the better. For example, crashes are often used for sound effects where nobody wanted to actually break an object for each take on set. You can then employ it into your video editing project at the right moment, lower the volume, blend it into the music and ambient sound, and then it will fit. If it is too drawn out, as often happens when sound effects are recorded on their own, then it will not feel natural. Unfortunately, most sound effects cannot just be trimmed as they have an arc from beginning to end. The best option is to actually try several different clips of the same sound type to find one that will eventually fit.