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#!/usr/bin/perl
use strict;
...
Time in 0 hours, 2 minutes, 0 seconds
Time in 15 hours, 2 minutes, 0 seconds
Total 15 hours, 0 minutes, 0 seconds

exact    : an exact, non-business calculation
semi     : a semi-exact, non-business calculation
...
business : an exact, business calculation
bsemi    : a semi-exact, business calculation
bapprox  : an approximate, business calculation

#!/usr/bin/perl
use strict;
...

$ perl test.pl
Time in 0 hours, 2 minutes, 0 seconds