NIS 2010 settings question

Realize that 2011 is out. This question involves NIS 2010 for those who still use it or have knowledge of it

 

NIS 2010  v 17.8.0.5

Vista Home Premium 32 bit with Vista SP2

 

Following the advice given here, I have NOT messed with the NIS 2010 settings other than

A. to turn early load on (which was suggested by a majority of Gurus)

 

B Change the autoblock of  an attacking computer from 30 mins to 48 hours

 (the setting located in Intrusion Prevention>Intrusion AutoBlock)

 

 

My questions:

 

1. Is it ok to have chnaged the autoblock of an attacking computer to 48 hours rather than the default 30 mins?

 

2.Can this cause problems?

 

3.Should I set it back to the default of 30 mins?

 

Much thanks in advance