Per Table 1.5, the maximum permitted FINAL setting time of Ordinary Portland Cement is:

1. Table 1.5 lists the maximum final setting time as 600 minutes for OPC (33, 43, 53 Grade), low heat, rapid hardening, Portland Pozzolana, Portland Slag, hydrophobic Portland and super sulphated cements. 2. The minimum initial setting time is 30 minutes (60 minutes for low heat and hydrophobic). _Source: IGNOU ET-522 Block-1 Unit-1 Cement, Table 1.5, §1.9, p. 13_