I suggest to look up perlman:perlvar of which I here cite:
$BASETIME
$^T
The time at which the program began running, in seconds since the epoch (beginning of 1970). The values returned by the -M, -A, and -C filetests are based on this value.
So you might be looking for something alike this
my $runTimeInSecs = time() - $^T;
Have a nice day
All decision is left to your taste
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