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Internal Audit at big 4

I currently work in external audit at a big 4 firm. I am considering switching to internal audit at another firm, but wanted to hear other's perspective on this. 

I haven't met anyone from my current firm that works in this line of service, so I want to see if someone could provide me with some insight.

How are the hours? Is there much traveling involved? 

I know these can vary by engagement, but if someone could share their experiences that would be great.