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#!/usr/bin/perl -wl
use strict;
...
10000000
100000020.5
1000000000

now
1 second
...
115 days, 17 hours, 46 minutes, and 40 seconds
3 years, 62 days, 9 hours, 47 minutes, and 0.5 seconds
31 years, 259 days, 1 hour, 46 minutes, and 40 seconds