Question on PvP drop system.

Hey,

I'm thinking, atm, of training in HOTSPOT for 10H straight without killing anyone etc., and then go do KT. But I'm concerned that it will be a waste of time?
Anyone tried staying up there for 5H+? Cuz I want to do 10H, but I'm not sure if it's worth doing it, or should I just do like 3H or 5H, then KT...

As it's stated in RuneScape website...:

So does this Drop potential have any limits? Or it's like unlimited.. lets say more I stay on hot and higher my potential is, the higher the AVERAGE value of drop is? Like if I stay for very very long, then the average value of drop is like 10-30M or something?

I'm confused.com here.. Anybody tried building up their potential for that long? Or got any info on this?

Thank's.