Ok, that helps allot - thanks!
I had looked through all the options but missed Options/Switches/Automatic Search Interval. Obviously I didn't look close enough.
So this interval ONLY applies to Internet-Watch-Lists?
It hadn't occurred to me that some posts would disappear so quickly. Now you got me wondering what I'm missing out on
So now I understand the appeal of unlimited search. For now though, with my 2 simple watch lists I'm good. Never really made proper use of them or even understood them that well. The same goes for search. I'm starting to see the light though. With only 2 watch list now, I'll be able to search a couple of times a day with room to spare. Once I fine tune things and get smarter I might need unlimited.