For each web hosting plan, the “max_user_connections” limit, for MySQL, is 25 concurrent connections.

This limitation is not related to the number of simultaneous site visits; this represents just an SQL query concurrent connections limit. An SQL query execution time is extremely short, therefore even 200 people accessing a WordPress website in the same split second, can not trigger this limit. In fact, 99.99% of web hosting users could not possibly trigger this restriction.