Thousands-Block reservations are reserved for a period of 3 months from the Part 3 date approving the reservation. The Thousands-Block reservation will be automatically cancelled and the Thousands-Block will be returned to the pool one day after the original reservation expiration date unless an extension is requested prior to the reservation expiration date.

A Thousands-Block will remain in reserved status until:

• A SP requests assignment of the reserved Thousands-Block.
• A SP requests to cancel the reserved Thousands-Block.