Thanks to all who replied re a calculator that could manage durations. In
the end, I decided to go for a physical unit, as I dont have access to and
dont want to install a spreadsheet application on my work machine.

For anyone who is in need of something similar, I did find a small app
called CalcWorks SE which will do the job, but will not accept timecode
format without decimals, so, good in a pinch, but not so good if you are
used to typing timecode.

Ah, do you mean timecodes as in film/video SMPTE timecodes?

If so you might also look at 'Calc timecode', available from

<http://www.hinton.demon.co.uk/mac/macsoft.html>

Thanks,
Shay
--
=========================== Shay Telfer ================================
Perth, Western Australia Technomancer Join Sungroper in the
Opinions for hire [POQ] 2003 World Solar Challenge
[EMAIL PROTECTED] fnord <http://sungroper.asn.au/>