Is there a max height/width for images in signatures?

Title.

Like, the avatar max is 250x300, and there are preferred dimensions for banners in profiles.

So, are there preferred dimensions for images in signatures? If there aren't any preferred or no max, can you just arbitrarily give me one because I suck at dimensions lol.

are you wanting the image to span the entire width of the post? I think that's about 800 px.

Okay, thanks. I think that... helps. I prob won't make it that long but yeah, that helps.