It has happened to me too. Analyzing further with tcpdump and strace i could 
see that the retry speed rate seemed to be lower (maybe due to nmap adapting to 
the conditions of the network like weak connection or firewalls) but the same 
nmap command would finish in 15 to 20 minutes. I tried changing the timing 
options in the nmap portscanning plugin but never could confirm if it 
completely solved the issue as it happened only sometimes.

Fabio
 
> No dia 10/11/2016, às 06:10, Christian Fischer 
> <[email protected]> escreveu:
> 
> Hi,
> 
> On 09.11.2016 22:48, [email protected] wrote:
>> A good understanding
>> of this behaviour would be great.
> 
> the nmap.nasl is just a "wrapper" of nmap and is calling plain nmap so
> you might need to dig into nmap itself to see why it is sometimes faster
> and the other time not.
> 
> Regards,
> 
> -- 
> 
> Christian Fischer | PGP Key: 0x54F3CE5B76C597AD
> Greenbone Networks GmbH | http://greenbone.net
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