Runway Lengths

[robin303]

Howdy, I have downloaded several sets of sceneries in which I have a lot of runways without the length mentioned. They are small remote grass airfields. Anyway how do I judge or guess how long they are.
Thanks.

[Kimber]

60knts is about 100 Feet per second, do a fly over and count
Mississippi's!!

[robin303]

Thank Kimber I'll give it a try.