Increasing the INACTIVITY LOGOUT in WebProfile Configuration

Hello Experts,

   Please someone advise me what would be disadvantages of increasing the inactivity logout for the entire WebProfile because one of the Process is timing out and failing. I am discussing with the development that optimizing the code will give us better results rather than increasing the timeout of the entire portal. The inactivity logout is already 12,000 seconds(200 mins) in our system.

   

Thanks..