well it depends on your temperatures, as long as they stay under the reccomended maximum temperature then yes it's fine, look on Intel's site and look up your particular processor since I don't know what its thermal envelope is, but my CPU for example is safe under 67.7c.
Why would you want to run TAT with those settings for that long? That is some very heavy throttling. 12.5% is the minimum throttling right? So 87.5% is a lot of idle time.
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