Where is Workflow History List

 

Well the Workflow History list is hidden.

Where to find: But many times we want to go there and check our workflow.

So here is the link

https://yoursite/Lists/Workflow%20History/AllItems.aspx

You can also find this in SharePoint designer. 

Open the site in designer

Navigate to All files

Click on Lists in All Files.

You will find Workflow History there

How long and how much gets Logged: By default, the logs are kept for 60 days.

To stop cleaning: If you want to keep the logs in history List for an longer time, you can do it by modifying settings of Timer job. To do so go to Central Administration –>Operations ->Global Configuration ->Timer Job Definition. Here is a msdn link https://technet.microsoft.com/en-us/library/cc298800.aspx