NIS 2010 Netbook Edition - Idle Time Full System Scan and Optimizer tasks - when will they run?

I purchased NIS 2010, after using the Trial version, about a week ago.

 

So far, it hasn't run either an Idle Time Optimize or Full System Scan - but then, I haven't had it on mains, idling, for very long, so:

 

1. How long does the system need to idle for to allow these tasks to run?

 

2.0 I've not changed any of tasks scheduling, so, when, exactly, should these run?

2.1 I know the Full System Scan runs 'weekly' but, is that 'after a week' or 'at a certain time each week'?

2.2 I've yet to figure out how often the Optimize taks should run, where is this shown?

 

Thanks, in advance.