OK, I think I've sorted it. Well it seems to work anyway. I don't know
whether I stumped you all, or it just wasn't clear enough. Or maybe the
problem wasn't interesting enough. Anyway, if anyone's interested,
here's what I came up with eventually. And my God is it a loooong one:

=IF(B15="","",IF(AND((B14<(LEFT(B14,5)+"22:00")),( B15<=(LEFT(B15,5)+"06:00"))),((B15-(LEFT(B14,5)+"22:00"))*24),IF(AND((B14=(LEFT(B14, 5)+"22:00")),
(B15<=(LEFT(B15,5)+"06:00"))),(B15-B14)*24,IF(AND((B14(LEFT(B14,5)+"22:00")),(B15=( LEFT(B15,5)+"06:00"))),(((LEFT(B15,5)+"06:00")-B14)*24),8))))




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HappyTrucker
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