UMD - Emulate a Race ... does it have a duration?

[Miss Disaster]

Hi Everyone.

I have a question about the Emulate a Race option of the Use Magic Device skill.

Let's say my human PC rolls for a successful Emulate a Race (DC 25) to use an "always on" Orcish-race-only magic item ... when does she have to make another successful emulation roll to continue gaining its benefits?

In essence, what is the duration of a given *successful* UMD: EaR roll for a given "always on" racially-restricted magic item outside of my race?

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Thank you!

[Belafon]

Use Magic Device wrote:

You make a Use Magic Device check each time you activate a device such as a wand. If you are using the check to emulate an alignment or some other quality in an ongoing manner, you need to make the relevant Use Magic Device check once per hour.

[Miss Disaster]

Thank you, Belafon!