Thank you very much!

The link to the ppm repository and the hint that DateTime::Span is in the DateTime::Set distribution did it!
Now have run the new script - in fact your script - against the "real life" data from the first post. 
Start: Tue Mar 27 21:12:58 2012
End: Tue Mar 27 21:13:34 2012

[download]
That means over 15 times faster!
Many many thanks again!
VE

In reply to Re^4: Calculation of the time overlapping by vagabonding electron
in thread Calculation of the time overlapping by vagabonding electron

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