The sed and dc combo are perhaps not as readable, but there was a time before the dawn of the One True Awk. :-) sed '1s/.*/0/; s/;[^;]*$//; s///; s/.*;//

The sed and dc combo are perhaps not as readable, but there was a time before the dawn of the One True Awk. :-) sed '1s/.*/0/; s/;[^;]*$//; s///; s/.*;// s/00$//; s/:..$/+1++/; s/:$/++/; s/:/ 60*/; $s/$/p/' | dc