Times between 4.5 and 4.6 are very good. 4.7 is OK, but by NFL standards, anything above 5 seconds is only for linemen, and 4.5 or less is considered fast. Just for your information: The fastest time officially recorded by the NFL was 4.29 seconds by Cameron Jobe in 1989 [1], although the NFL did not begin electronic timing until 1990. In the electronic timing era, the fastest recorded time at the NFL Combine was 4.25 seconds (hand time) by cornerback Fabian Washington in 2005. However, his official time at the 2005 Combine was 4.31 seconds[2] Most other times close to 4.0 are untrustworthy due to the use of hand timing, but still many use hand timed 40's such as players including Jerome Mathis (4.25) [3],DeAngelo Hall (4.15)[4][5], Michael Vick (4.25),Lee Suggs (4.27)[6], Bo Jackson (4.12)[7], Don Beebe (4.21)[1], Michael Bennett (4.13)[8], Randy Moss (4.25)[9], Darrell Green (4.15[10], 4.2[11]), Laveranues Coles (4.2)[12], and Nicky Schlatz (4.00)[13] have approached that mark. Although 40 yards almost never run, the 60 meter dash is a well-regulated, frequently ran track and field distance, the official record for which is 6.39 seconds. However, tapes of sprinter Ben Johnson's world-record breaking 1988 100 meter dash (which was later annulled due to Johnson's steroid use) show that Johnson ran the 60 m in 6.37 seconds; this is considered the quickest start to a race ever.[14] Johnson covered the first 40 meters in 4.53 seconds. It is often reported wrongly that Johnson's first 40 yards was timed; it was actually his first 40 meters. His 40 yard time was an exceptionally fast 4.14 seconds.