How long does it take for a second and third half life to occur during radio active decay ?

How long does it take for a second and third half life to occur during radio active decay if the first half life takes 8 days?

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VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).