A method, computer program product, and computer system for generating a timing sequence for activating resources linked through time dependency relationships. A Direct Acyclic Graph (DAG) includes nodes and directed edges. Each node represents a unique resource and is a predefined Recovery Time Objective (RTO) node or an undefined RTO node. Each directed edge directly connects two nodes and represents a time delay between the two nodes. The nodes are topologically sorted to order the nodes in a dependency sequence of ordered nodes. A corrected RTO is computed for each ordered node after which an estimated RTO is calculated as a calculated RTO for each remaining undefined RTO node. The ordered nodes in the dependency sequence are reordered according to an ascending order of the corrected RTO of the ordered nodes to form a timing sequence for activating the unique resources represented by the multiple nodes.