Recovery Time Objective (RTO)refers to the amount of time a system, application, or process can be down before it causes significant harm to the business. In this scenario, the betting site determined that if the payment gateway system is down for more than an hour, it would result in substantial financial losses ($100,000) and customer attrition (15% short-term and 25% permanently). The focus on the acceptable downtime before these impacts occur aligns with the definition of RTO. The mention of "two hours" in the question seems to be a slight mismatch with the "more than an hour" in the description, but the context still points to RTO as the best fit, as it defines the target time frame for recovery.

Recovery Point Objective (RPO)refers to the amount of data loss (measured in time) a business can tolerate, not the duration of system downtime.

Maximum Tolerable Period of Disruption (MTPOD)is a broader term that encompasses the total time a business can withstand a disruption, including recovery and other factors, but it is less specific to the immediate system restoration time frame described here.

Work Recovery Time (WRT)is not a widely standardized term in this context and typically relates to the time needed to recover specific work processes, not the system downtime tolerance.

Thus,RTOis the most precise term for the time period the business can tolerate the payment gateway being unavailable.