Long transfer time personal to trading and vice versa

So I transferred some eth from personal to trading account. The transfer tab confirms it in my nash account after almost 20 block confirmation.

Why is it so slow, standard practice is 2 block confirmation for eth.

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Personal <> Trading is 12 blocks on ETH (~3min or 180seconds), which is the standard practice for irreversible transactions. Which service is using 2 confirmations ?