Time wise, what are you fastest, medium, and slowest PLLs? Fastest for me are the U perms, medium is the F, and slowest is probably one I don't know so have to use 2L PLL, like a E.
Off topic: very recently. I just found a good deal with a lot of space and cheap bandwidth. ;-)
I use it mostly to post reports and host pictures and videos.
Weighted time is equall to your average for the case multiplied by its probability (or in the sheet: your time divided by the number in the other column)
It reprensents how much time this case contributes to your overall PLL average.