How to enter key passphrase only once instead of thrice

passphrasessh

I have a passphrase protected key file to access server. I have to enter passphrase thrice every time I open my computer. Once for pagent (putty, winscp, …). Once for bash (git, …). And once for powershell script that backs up my mysql database. How can I enter it only once and use it for all three functions?

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