Breathing endurance control

Mistress Zora would like to know the slave's level of training. How long can he hold his breath for now? He had to practise his stamina and should now be able to hold his breath for a long time. At least that's what Mistress Zora expects of him and checks. She holds his mouth and nose shut with both hands and counts the seconds he can go without oxygen. Will it be as long as the slave says...?

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