How much postcrete per swing leg hole?

[blackcloud]

Hi allwe have these swings for our children and wondering how much poatcrete per swing leg hole do people recommend?
I'm thinking 2 x 20kg bags of postcrete for a 1m hole? Or just 1 x 20kg of postcrete for a 1 metre hole?

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[Wayners]

Go deep enough to hit solid ground and bigger at the bottom of hole than the top. That's way it won't pull out.
Around ¾ of a bag per hole if you don't dig it too big. Keep it narrow and deep.
The swing legs don't need to be deep just held in concrete