I want to have Gregg come calibrate my HDTV in Feb/Mar and I keep hearing that before you have an ISF calibration done, it's best to have at least used it 100 hours or more. Seeing as how I usually only watch DVDs on the weekend, I won't be anywhere near this mark before then. I also don't want to have the calibration done and then have the convergence start drifting (Does this actually happen?). I could wait, but I'd rather just have the calibration done ASAP instead of waiting. Is this a total non-issue or is it actually something to worry about?