Time taken in Apache logs

Hello,
We are using Apache log file %T to display the time in seconds to serve up the request. In some cases the response time is high (10 to 60 seconds) even for .js and .gif files.
Does that mean that the user is from slow connection? DOes anyone show what Apache options to use so I can get just the time APache took to get the response (excluding any network timing) so that I can be sure that my website is not having any perfornamce issues.

Thanks!