The longest time an activity can be unavailable before the resulting harm to the organization becomes unacceptable.
The Maximum Tolerable Period of Disruption is the outer limit of downtime an organization can survive for a given activity. Beyond it, the consequences threaten the viability of the organization or breach legal and contractual obligations.
The RTO must always be shorter than the MTPD, leaving a margin so recovery completes before tolerable limits are exceeded.
Related frameworks
KaitoSec