show most viewed posts of last days by link?

Have you tried this plugin : WP Most Popular ?

You can display popular posts from the last day, 7 days, 30 days or all time.

From the “Other notes” page :

Usage

There are two ways in which you can use this plugin.

1. As a sidebar widget
2. Custom function in your theme files

Using the widget is the easiest way and recommended for most users. If you are a developer and want to integrate the plugin in to your existing theme, then read the information below.

Firstly, the main function which you will need to include in your theme to fetch the popular posts is called wmp_get_popular().

You can pass that function the following parameters in array form:

• limit (integer)
The number of posts you would like to display i.e. 5
Default: 5

• post_type (string)
The post type you would like to display
Example: post
Default: All post types

• range (string)
In what date range would you like to display popular posts in
Accepted: all_time, monthly, weekly, daily
Default: all_time

Those are the current parameters that the plugin supports.

Let’s look at an example of how to display the most recent popular posts in a unordered list :

<?php
echo '<ul>';
$posts = wmp_get_popular( array( 'limit' => 10, 'post_type' => 'post', 'range' => 'all_time' ) );
global $post;
if ( count( $posts ) > 0 ): foreach ( $posts as $post ):
    setup_postdata( $post );
    ?>
    <li><a href="<?php the_permalink() ?>" title="<?php echo esc_attr(get_the_title() ? get_the_title() : get_the_ID()); ?>"><?php if ( get_the_title() ) the_title(); else the_ID(); ?></a></li>
    <?php
endforeach; endif;
echo '</ul>';
?>