There are 2 types of "typical" days in the life on an internal auditor.
Type 1 - on site with the client.
Here you look at the effectiveness and efficiency of operations, the reliability of financial reporting and check is the company compliant with applicable laws and regulations.
There are different types of audits:
1. Full scope review targeted principally at finance areas. Covers controls over completeness, accuracy and validity of transactions; security of physical / monetary assets; security of IT operations; accuracy of reporting within CRH. Where the business unit is classified as a tier 1 entity for SOX, the review will incorporate testing for SOX purposes
2. Limited scope review can take many forms: SOX testing, IA work for External Auditors, narrowly focused / specific risk internal control review, etc.
Type 2 - Back at head office.
Here a typical day would consist of preparing for an audit (writing planning documents, organising travel schedules, preparing lead schedules and test plans) or writing the report of the audit which you have just completed.