Title Length for SEO: Importance of the 70 character limit for Google
According to Google's Product Feed Specifications, the 'title' attribute has a suggested maximum length of 70 characters. Therefore, products with long titles will still be listed in search results.
However, since Google search results only display about 70 characters of the title, and products with long titles are not as user-friendly, it stands to reason that products with longer titles may be demoted in the ranking. Furthermore, the words after 70 characters may not be considered as relevant. Some SEO experts also recommend keeping page titles under 70 chars. Therefore, our opinion is that while an appropriate title length is important, it is not strictly necessary for every product. Similar reasoning applies to page titles for Google's organic search ranking.
Note that we have no direct knowledge of Google's algorithms, so the above suggestions represent an opinion only.
If your product titles are excessively long, we can program your (Custom) feed so that all the titles are limited to a 70 character title length by truncating long titles at a word boundary. However, we generally do not recommend this. The loss of visibility penalty due to the lack of important title keywords is typically greater than the minor ranking penalty due to having more than 70 characters. Keywords in the title are very critical to getting your products to show up for particular searches.