Cache SSH signing passphrases

[IceflowRE]

Is there any way to cache SSH signing passphrases?
I want to only type the passphrase once (while committing) and then it should be cached until reboot or e.g. 12h. With gpg keys the gpg-agent could do that. But somehow this does not work with SSH keys.
I am open for any ideas from the right configurations in gpg to custom wrappers.

Note: i am on windows.

[love-linger]

What do you mean by SSH signing passphrases? The private SSH key or the secret of the private SSH key?

On Windows, I recommand you to use Windows built-in SSH (by selecting Use external OpenSSH while installing git)

After that, go to Services and start the built-in OpenSSH Authentication Agent and switch the Startup type to Automatic.

[IceflowRE]

secret of the private SSH key

yes the passphrase. of the SSH key. What you suggested works only for authentication (push/pull). But i especially asked for signing commits. That's where this is not working.

[love-linger]

Then you can use ssh-add <PATH_TO_PRIVATEKEY> to add it to ssh-agent manually. But you may need to do this each time you reboot your PC.