Japanese characters occupy different numbers of bytes depending on encoding and character. Each character still counts as one character.
There is no fixed upper limit on title
element content length, though various recommendations have been made in different documents. E.g., HTML 2.0 recommended that titles should be fewer than 64 characters. Google instructions do not specify any specific limit, just this: “avoid unnecessarily long or verbose titles, which are likely to get truncated when they show up in the search results”.
Similar considerations apply to descriptions in meta
tags.