Device heat up. What time before it heats up is considered good?

Unity Engine
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1

Hi,

could not find anything that answers this in a detailed way ?

I managed to optimise the game to the point that the device heat up(real heat up and frame drop) only after 90 min of continuous gameplay. Is that good ?

Tested on Samsung s9, and the game targets OpenGLES 3.1, it probably does not matter but still.

Thank you!

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