I'm not sure, I would say it's because not all 16 hosts are 'on line' at that time! I certainly do not keep Limewire or my computer running when I'm gone to work or somewhere. In fact, I unplug my DSL every time too, just to keep hackers out! I have tried to warn ppl getting uploads from me that I'm logging off and will be back the next day. But most ppl have their 'chat' option turned off. I know it took one person about five days to get one particular upload from me!