Final answer:
The pilot must have the flight review completed by August 31, two years after the initial review, based on the 24-month FAA requirement.
Step-by-step explanation:
The deadline for the pilot to complete the flight review is based on Federal Aviation Administration (FAA) regulations, which specify that a pilot must have a flight review within the preceding 24 calendar months before acting as a pilot in command.
If a pilot had a flight review on August 8 of this year, the 24-month period would extend to the end of August two years later, not just to the same date.
Therefore, the last day the pilot can complete their next flight review is August 31, two years later.