Change default recovery link expiration time

I would think this would change it to a month:

add_filter( 'password_reset_expiration', function( $expiration ) {
    return MONTH_IN_SECONDS;
});

using the built-in MONTH_IN_SECONDS constant.

For a quick testing:

add_filter( 'password_reset_expiration', function( $expiration ) {
    return 60; // A minute
});