Sunday nights are usually the best for me (7pm and after)...I'm almost always home then. I suppose Saturday afternoon would be ok, but that's prime time for doing stuff usually. It's almost better just to hop onto the server and idle than it is to not be on there and not idle. I find that if I stay online long enough, usually someone will drop in, and hopefully stay. If noone is there, they often just have a quick look and leave.
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1991 LX Hatch 5.0L