You have 140 characters to fill for each of your items’ titles (and make sure you use them all!), but the first 40 are ABSOLUTELY CRITICAL for your SEO success, both on Etsy and Google.
There are a couple of reasons for this:
Etsy ranks the first 40 characters as “more relevant” because they are at the front of your listing title. This simply means that if you want to get found in search easily for a specific keyword phrase, put it in the front! Etsy will give that keyword phrase a higher value in search placement
Buyers only get a glimpse of your item’s title through search-- they have to click through to the actual item to see the full title, so they better know what you’re offering in those first few characters of the item’s title.