I think it is 10 minutes yes. The reason for this is so you can correct mistakes you notice within 10 minutes but not alter your post later on. In the past some people had changed posts so that ones after theirs did not make sense.
If you want something changing after the 10 minutes you can always PM me and I can do it for you. This is a free of charge service from your friendly moderation team.
That means me because I am the only friendly one
