No message on idle tasks? / timeout+delay question

My dad and I have NIS 2011 installed - ive had mine a 10 days and he's had his a few days - he says that when he away from computer and comes back there is a message saying.."while you were away norton is checking your computer" or something along those lines.... thing is I get no such message? i have the idle time scans and optimize set and changed the timeout to 1 minute to test and i get no message when it start to run tasks?

 

is this just on certain tasks this message comes up? - maybe full scan? or optimize?

 

also

 

what is the diff between IDLE TIME OUT and AUTOMATIC TASK DELAY? - its not very clear to me... does this mean after the 10 minutes of idle it will wait a further 20 minutes before running the idle scans? - seems a bit pointless too me... just increase the IDLE TIME OUT to 30 minutes... 

 

 

thanks