Act 2 fallen is probably your quickest path to 100. They always occur in large groups and are easily dispatched. Give the same XP as a hulking phase beast (1600) with far less effort.
Well, in the blog Jay said 1st paragon lvl will take time similar to from 59 to 60, which according to the chart is ~2,5m. Your estimate is almost 3 times higher.
My handy dandy bradyguide says an unburied gives 2750 in hell, 4000 in inferno. That's not 3x more.
Act 4 Temptress gives 1550 in hell, 1600 in inferno. That's not 3x more.
So, these numbers could change of course. But still. Seems odd.
On the plus side, in dollars, this is like 8 hours of the US budget deficit for 2012.