properties /measurement

HOW LONG THE PRODUCT TAKES TO REACH A NAMED STAGE OF ITS CURE, as a numeral with a time unit and a REQUIRED `cure_stage`. CARDINALITY MANY, because every sheet in the trade publishes it more than once: LOCTITE EA E-20HP prints `Working life 20 minutes` AND `Tack Free Time 40 minutes`; EA 3450 prints `Pot life ISO 9514, 5 minutes` AND `Fixture Time ISO 4587`; 3090 prints `Open Time 90 to 180 seconds` AND a fixture time; Sikaflex-255 prints `Open time 20 minutes` AND `Skin time 40 minutes`; Sikaflex-221 prints 45 and 60; Permatex writes that Ultra Grey `dries tack free in one hour and fully cures in 24 hours`. THIS PROPERTY IS AN ADVERSARY AMENDMENT TAKEN WHOLE AND IT REPLACED A DRAFTED `working_time` [A-1]. That slot named ONE of four stages and would have thrown away the number the buyer of a gasket maker actually reads - and worse, it left LOCTITE SI 5900 and SI 5910 as ONE STATEMENT in this grammar, two current Henkel products agreeing in all seven fields of the maker's own headline table and separated by a tack-free time (7 to 24 minutes against under 40) and a hardness. That is the b155 B6ES/BP6ES defect, found by the adversary for the fourth proposal running. THE PROOF IT EARNS A SLOT AT ALL is unchanged and stands under the new shape [A13]: Araldite Standard publishes a pot life of 100-150 minutes and Araldite Rapid 5-8 minutes, same brand, same chemistry, same two-part system, same paste, same duty - byte-identical without it. Reuses the live `TimeUnits`; no new machinery. Two limits recorded rather than guessed: fixture time is also published as a per-SUBSTRATE table and full cure against a temperature and a humidity, and neither qualifier exists [H5-f2]. Concern measurement.