in my vps box:

$ time perl -e ''

real    0m0.003s
user    0m0.000s
sys 0m0.000s

$ time perl -e 'for($i=0;$i<=0;$i++){}'

real    0m0.003s
user    0m0.000s
sys 0m0.000s

$ time perl -e 'for($i=0;$i<=10;$i++){}'

real    0m0.004s
user    0m0.004s
sys 0m0.000s
$ time perl -e 'for($i=0;$i<=100;$i++){}'

real    0m0.004s
user    0m0.000s
sys 0m0.000s
$ time perl -e 'for($i=0;$i<=1000;$i++){}'

real    0m0.003s
user    0m0.000s
sys 0m0.000s
$ time perl -e 'for($i=0;$i<=10000;$i++){}'

real    0m0.005s
user    0m0.004s
sys 0m0.000s
$ time perl -e 'for($i=0;$i<=100000;$i++){}'

real    0m0.015s
user    0m0.012s
sys 0m0.000s
$ time perl -e 'for($i=0;$i<=1000000;$i++){}'

real    0m0.094s
user    0m0.088s
sys 0m0.004s
$ time perl -e 'for($i=0;$i<=10000000;$i++){}'

real    0m0.731s
user    0m0.724s
sys 0m0.004s
$ time perl -e 'for($i=0;$i<=100000000;$i++){}'

real    0m7.253s
user    0m7.256s
sys 0m0.000s
$ time perl -e 'for($i=0;$i<=1000000000;$i++){}'

real    1m13.921s
user    1m13.828s
sys 0m0.008s