We know that we could enhance the core Forum module in Drupal 7 with the help of the Advanced Forum module.
Drupal 7 – Strengthen the core Forum module by Advanced Forum

Today, i would like to share how to add the forum topic view count on the forum topic listing page.

1. Enable the core Statistics module.

 

2. Configure the Statistics module @admin/config/system/statistics. Enable the Count content views option.

 

3. Go to the forum topic listing page and the view count should be working now.

 

Done =)

Reference: Drupal Module – Advanced Forum