It is a difficult decision.  Somebody suggested me to lower it and I think it is reasonable so I made it.  

1600 mins is around 1 day.  If you regret it, you can change it in around 1 day.  However, once published, you cannot edit it because others are replying and seeing it already.  Once you sent out the email to others, you cannot change it.  Once you post it, you cannot change it even in facebook.  You can only delete it.

also, may I know any example that you have to edit after 6000 mins?

we're just afraid that the readers might be confused when somebody change often for the published content.

引用:

原帖由 我係一名火星人 於 2012-6-14 13:34 發表
我就諗到呢！其中一個好明顯既例子：巴士路線建議
其他人不斷比意見，我地會就住佢地既意見嚟修改，務求得到一個perfect既建議。

yap, you can post another one or make a new post instead when the final proposal is finalized.  the reason is it will make more troubles if we allow the one who make posts change a lot and hard for others to reply and follow.