25 visitors does not mean that you have 25 open SQL connections. An SQL connection is opened when a script is called and will be closed again once the script has finished retrieving data and displaying it on a page.
This means that if 25 people would open a page each 5 seconds apart, then you will still have 25 users (with a 15 minute cookie timeout) but probably only 1 SQL connection at any time. On the other hand 1 user could be opening 30 pages at the same time and create 30 connections in this period.
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