While there are no world "record" times for the men's and women's marathons ... races are held on the streets and courses vary widely ... there are world "best" times.  Patrick Makau (KEN) ran 2:03:38 in the men's division of the 2011 Berlin Marathon and Paula Radcliffe (GBR) ran 2:15:25 in the women's division of the 2003 London Marathon.
 
This table shows Istan's "best" times (per/mile) at various distances and terrain ... both in clock time (day of the event) and age-graded time (clock time corrected for age).
 

Distance (terrain)
Clock 
Age-Adj
Event (date)
"Walk and Jog" Category (2011-     ) 
10 Km (road)
13:24
09:55 
Running is for the Birds (2011)
Half-Marathon (road)
14:17
10:36
Smith Rock Summer Classic (2011)
Half-Marathon (trail)
16:06
11:56 
Haulin' Aspen (2011)
Marathon (road)
14:44
10:57
Sunriver for a Cause (2011)
"Run with Walk Breaks" Category (2007-2011
Half-Marathon (road)
10:29
07:56
Smith Rock Summer Classic (2009)
Half-Marathon (trail)
12:27
09:25
Haulin' Aspen (2009)
Half-Marathon (trail & road)
11:30
08:42
XTERRA Trail Run Nationals (2009)
Marathon (road)
11:38
08:50
Foot Traffic Flat (2009)
Marathon (road & hills)
12:31
09:30
Crater Lake (2009)
Marathon (trail)
15:01
11:32
Timberline Trail (2008)
Marathon - 2 in 2 days (road)
12:57
09:57
Columbia River, Tri-Cities (2008)
Marathon - 2 in 7 days (road)
11:58
09:05
Pacific Crest, Foot Traffic Flat (2009)
Marathon - 3 in 8 days (road)
12:43
09:46
Humboldt, Columbia River, Tri-Cities (2008)
Marathon - 4 in 15 days (road)
12:42
09:45
Spokane, Humboldt, Columbia River, Tri-Cities (2008)
Marathon - 5 in 22 days (road)
12:42
09:45
Portland, Spokane, Humboldt, Columbia River, Tri-Cities (2008)
Full + Half-Marathon - 2 days (road)+(trail)
12:30
09:29
Crater Lake, Haulin' Aspen (2009)
"Run Only" Category (1975-1995)
10 Km (road)
06:48
06:14
Scandia Run (1986)
15 Km (road)
07:46
 
Cascade Run Off (1978)
20 Km (road)
07:12

Pear Blossom (1987)
25 Km (road)
07:09
 
Nike-OTC 25K (1987)
30 Km (road)
07:06
 
Ultra Oregon 30K (1981)
Half-Marathon (road)
06:33
06:17
Bohemia Mining Days (1982)
Marathon (road)
07:10
07:03
Nike-OTC Marathon (1981)
Marathon (road & hills)
10:41
10:20
Crater Lake (1983)
Marathon - 2 in 8 days (road)
07:45
07:34
Fast Run on the Bank, Portland (1982)
50 Km (road)
08:57
08:40
Roseburg Track Club 50K (1983)

Male Age Factors
5 Km = 1.00 @ 27 yrs
10 Km = 1.00 @ 27 yrs
Half = 1.00 @ 31 yrs
Mar = 1.00 @ 35 yrs

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