This is kinda related to title tag and SEO. I have always maintained 60 characters in my title tags. I am wondering at what point extending a title tag description helps or hurts SERPs? I know this would also depend on page content and other factors.

Anyone have any feedback or experience with short or lengthy title tags?

Also does it matter if you use a space, comma or dashes in the tag?

Example;
Green Onions, Big Green Onions, Green Onions in Virginia
Green Onions - Big Green Onions - Green Onions in Virginia
Green Onions Big Green Onions Green Onions in Virginia

Thanks,
Rick