Generally, for the distribution to be considered non-taxable, it must be rolled over (deposited) into the IRA (or another of your IRAs) within 60 days of receiving the distributed assets. After the 60-day period, any amount that has not been replaced cannot be rolled over and will be treated as taxable. If you are under age 59.5, the amount will also be subject to the 10% early-distribution penalty, unless you meet one of the penalty exceptions.
Exception: The IRS allows the rollover to be made after the 60-day period only if you were unable to meet the 60-day deadline because of a disaster or other events beyond your reasonable control.
This question was answered by Denise Appleby