Manon has got the chart. I might have had the numbers slightly off -- the chart seems to peak at 55 rather than 65 minutes. It is still an approximation to the extent to which it doesn't monitor GS sublevels, but I just wanted to point out that we have better information than a random guess between 48 and 80.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."