I've had a few folks ask how to alter the amount of time the “!New” icon shows up next to a recently added SharePoint list items. I believe the default timing is set to 24 hours (That is, a “new“ item is designated for the first day it is listed).
One person asked how to simply turned it off. Another asked how to extend it to a longer period so more users are aware of new content. The answer, luckily, is the same... You need to use a command line statement. The syntax is below.
Note a few thing:
1. To turn off the “!New” icon, set the number of days to zero
2. The change is for ALL list items (not just documents) on the virtual server
3. The change is immediate and does not require an IISRESET
Run the following (you may need to navigate to the directory where stsadm resides):
stsadm.exe -o setproperty -pn days-to-show-new-icon -pv ## -url [Your Virtual Server's URL]
where ## is the number of days to show the “!New“ icon