Retrieve duration since sign up

WordPress doesn’t have a “Duration Since Signup” value so you’ll need to calculate it by finding the difference between the user registration date and the current date. I suggest getting the user above the conditional:

function set_mail_html_content_type() {
    return 'text/html';
}

add_action( 'user_help_signup', 10 ,2 );
function user_help_signup( $ID, //DURATION SINCE SIGN UP ) {
    $curr_user  = get_user_by( 'id', $post->post_author );
    $reg_date   = new DateTime( $curr_user->user_registered );
    $curr_date  = new DateTime();
    $days_reg   = intval( $curr_date->diff( $reg_date )->format( "%a" ) );

    if ( $days_reg > 3 || count_user_posts( $post->post_author ) > 1 ) {
        return;
    }

    $to      = $curr_user->user_email;
    $subject="Need help ?";
    $headers = array('Content-Type: text/html');
    $message="<h3>Hi {display_name}! </h3> <p>

    You signed up 3 days ago on mysite.com and we wanted to know if we could help you to get started ";

    wp_mail( $to, $subject, $message, 'Content-Type: text/html' ); 
}

We know that $curr_user->user_registered holds the date that the user registered and DateTime() will get the current date so we can use the built-in DateTime method diff() to get the difference and put it in as day format as %r%a. There’s a good StackOverflow Answer on getting the day difference between two dates.

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