Contracts II
Restatement Second of Contracts § 269
Temporary Impracticability or Frustration
Impracticability of performance or frustration of purpose that is only temporary suspends the obligor's duty to perform while the impracticability or frustration exists but does not discharge his duty or prevent it from arising unless his performance after the cessation of the impracticability or frustration would be materially more burdensome than had there been no impracticability or frustration.
Copyright, The American Law Institute