There is no single “correct” curing time that applies to all modified bitumens, because it depends mainly on the type of modifier, its concentration, temperature, and mixing/shear conditions. For SBS-modified bitumen, typical digestion times are in the range of 1 to 3 hours at 170-180 °C, until swelling and phase inversion are complete. For EVA or PE modifiers, curing is usually shorter, often 30-90 minutes, because the mechanism is mainly dispersion rather than swelling. Sulfur-modified systems may require an additional holding period to complete crosslinking. There is also no single international standard that fixes curing time. The process is governed indirectly by performance standards such as EN 14023 (PMB specification), ASTM D6164, and national PMB specs, which define final properties (elastic recovery, softening point, storage stability), not the digestion time itself. In practice, curing time is validated by property stabilization and storage stability tests, not by a fixed number in a standard.