Marathon training / planning

I ran 24 miles two weeks ago, 26 miles last week, and I'm on-track for 29 this week. The only glitch so far is that I wanted to work in a hydro-training class for cross-training on Mondays. It figures that the pool was closed Monday when I arrived at the club. I left my non-pool workout clothes at home so I just took a shower and went to work. :-(

I've had pretty good luck with race estimation calculators. To get my best guess at a marathon time, I used three methods and used three different distances in the calculators and took averages. The average is 3:27:05 which gives me only 3 minutes and 54 seconds to spare if I'm going to qualify for Boston. I need to do some hard work now and have good luck on Marathon Day.

1) McMillian calculator
43:48 10K = 3:25:33
1:14:28 10M = 3:28:34
1:36:33 Half Marathon = 3:23:37
Average 3:25:55

2) Running Times
43:48 10K = 3:25:34
1:14:28 10M = 3:30:54
1:36:33 Half Marathon = 3:25:11
Average 3:27:13

3) Double and add 15
1:36:33 Half Marathon = 3:28:06

Average of above
McMillian = 3:25:55
Running Times = 3:27:13
Average and add 15 = 3:28:06

Average of averages is 3:27:05