The time depends on the size of your property and how many circuits need checking. For a small flat, it can take a few hours. Bigger homes or buildings may take longer.
Yes, parts of the inspection require the power to be off. The electrician will tell you when it’s safe to turn it back on.
If the report shows any faults or safety risks, the electrician will explain what needs to be fixed. You can then arrange for repairs and get a follow-up test to confirm everything is safe.
Only a qualified and registered electrician should carry out an EICR. They have the right skills and tools to test your wiring safely and provide an accurate report.