You must complete the rollover by the 60th day following the day on which you receive the distribution. (This 60-day period is extended for the period during which the distribution is in a frozen deposit in a financial institution).
A written explanation of rollover must be given to you by the plan making the distribution.
The IRS may waive the 60 day requirement where failure to do so would be against equity or good conscience, such as in the event of a casualty, disaster, or other event beyond your reasonable control.
To obtain the waiver in most cases, a request for a letter ruling must be made which include the applicable user fee. Refer to the first Internal Revenue Bulletin of each year
to get the Internal Revenue Procedure for requesting a letter ruling.