Raw papaya meat tenderizer for biryani

How much should I use for 1 kg mutton for biryani purpose and 1 kg chicken for curry purpose?

Should I wash after like 30 min - 1 hr after marinating in papaya?And should I keep it in refrigerator or outside?

I'm afraid that it might cause any bitter taste and spoil the complete dish.

And last how long does papaya paste ne stored,I think more than half of will be wasted ,if we can't use it till next week.

And how different is the meat tenderized in curd vs papaya paste?

Thank you