$SIG{ALRM} = sub { report(); exit };
alarm(86400 * 3);

# your test code here
...
# at the end, print report
report();

sub report {
    # your reporting code
}
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At the end of your test script you invoke report(). If the script happens to run for three days, the alarm handler will invoke report() and terminate the script.

--shmem

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}