The length of the address doesn't really matter. It's what it start with. For instance, the following would be scams:
ebay.ru.com/sd7o234h9s8yfoL#
www.987947397/ebay/ksjhdfkjh/ebay
Real links ALWAYS have ebay.com at the beginning. Some will have something before ebay.com (like cgi.ebay.com) but that ebay.com must come before any back slash.