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zen% perl t1
807060464786760409757687767524310994172947695099349876516088e-7089
...

total: 13 wallclock secs (13.37 usr +  0.02 sys = 13.39 CPU)
zen%

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#!/usr/bin/perl -w
use strict;
...
sub time_delta {
  print +shift, ": ", timestr(timediff(@_)), "\n";
}