The height of the top floor of the towers was 1,348 ft (411.0 m).
The height of the root of the towers was 1,368 ft (417.0 m).
The height of the antenna/spire of the towers was 1,731.9 ft (527.9 m)
source:
http://en.wikipedia.org/wiki/Wtc
Given the approximate acceleration at the towers would be 9.8 m/s^2 we can calculate both the time it would take to fall, and the velocity at any given point.
Using the formulas available on this page:
http://www.grc.nasa.gov/WWW/K-12/airplane/mofall.html we generate the following (bolded lines are of greatest interest):
[table=""]Time|Accel - m/sec^2|Dist - meters
0.0|9.8|0.0
1.0|9.8|4.9
2.0|19.6|19.6
3.0|29.4|44.1
4.0|39.2|78.4
5.0|49.0|122.5
6.0|58.8|176.4
7.0|68.6|240.1
8.0|78.4|313.6
9.0|88.2|396.9
9.1|
89.2|
405.8
9.2|
90.2|
414.7
9.3|
91.1|
423.8
9.4|92.1|433.0
9.5|93.1|442.2
9.6|94.1|451.6
9.7|95.1|461.0
9.8|96.0|470.6
9.9|97.0|480.2
10.0|98.0|490.0
10.1|99.0|499.8
10.2|100.0|509.8
10.3|
100.9|
519.8
10.4|
101.9|
530.0
10.5|102.9|540.2
10.6|103.9|550.6
10.7|104.9|561.0
10.8|105.8|571.5
10.9|106.8|582.2
11.0|107.8|592.9[/table]
From this we can see that from the top floor it would take 9.1-9.2 seconds to reach the ground and the final velocity would be 89.2-90.2 m/sec.
From the root it would take 9.2-9.3 seconds to reach the ground and the final velocity would be 90.2-91.1 m/sec.
From the top of the spire/antenna it would take 10.3-10.4 seconds to reach the ground and the final velocity would be 100.9-101.9 m/sec.
Estimates on this vary do to visibility problems and which points are being used. I will use the values you provided in this post
http://www.internationalskeptics.com/forums/showthread.php?postid=2206211#post2206211 and go with 12-16 seconds.
[table=""]Reported Time|Calculated Time|%
12.0|9.1|131.9
12.0|9.2|130.4
12.0|9.3|129.0
12.0|10.3|116.5
12.0|
10.4|
115.4
13.0|9.1|142.9
13.0|9.2|141.3
13.0|9.3|139.8
13.0|10.3|126.2
13.0|10.4|125.0
14.0|9.1|153.8
14.0|9.2|152.2
14.0|9.3|150.5
14.0|10.3|135.9
14.0|10.4|134.6
15.0|9.1|164.8
15.0|9.2|163.0
15.0|9.3|161.3
15.0|10.3|145.6
15.0|10.4|144.2
16.0|
9.1|
175.8
16.0|9.2|173.9
16.0|9.3|172.0
16.0|10.3|155.3
16.0|10.4|153.8[/table]
We can see that the towers took somewhere between 115.4% to 175.8% free-fall time to complete collapsing. Personally, I do not consider 15.4%-75.8% margin of difference to qualify as being labeled "near".