What is the longest onomatopoeia?

The longest onomatopoeia is often considered to be "pneumonoultramicroscopicsilicovolcanoconiOSis," which, while primarily a coined term for a lung disease, is sometimes humorously referenced in discussions about sound Words due to its length. However, in terms of actual sound-representing Words, "splash," "bang," and "buzz" are more traditional examples, though they are significantly shorter. Onomatopoeias generally aim for brevity to effectively emulate sounds.