While there are a number of issues i wish i could sit down and discuss with you - there is a simple solution:

change this:

$total_time_hours += int($total_time / 60);
[download]

to this:

$total_time_hours = int($total_time / 60);
[download]

I will plug DBIx::XHTML_Table, but it does not total hours and minutes for you. Looks like i have some work to do now. :)

jeffa