Real-time and cyber-physical systems are developed through successive refinements from abstract requirements to platform deployments. While timing knowledge evolves throughout this process, existing stochastic real-time formalisms typically require uncertainty to be embedded from the outset or necessitate model reconstruction when new timing information becomes available, hindering iterative timing engineering. This paper presents a refinement-oriented timing specification framework built upon the Clock Constraint Specification Language (CCSL). It supports the progressive introduction of timing knowledge across three levels: logical timing relations, quantitative real-time constraints, and stochastic timing models. Instead of altering behavioural semantics, stochastic information is attached directly to timing quantities as a refinement. This enables implementation measurements and operational observations to be incorporated incrementally within a unified declarative framework. We implement our approach in an OCaml-based simulation tool and evaluate it on a simplified but representative Software-Defined Vehicle use case.

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