Open for load implies the load is turned off or open circuit? I am not understanding the terminology you are using?When 12v is provided at the "left" the curcuit should open for LOAD.
When 12v is missing again the curcuit should provide open LOAD for ~1 hour.
That solution is ultimately what I proposed to our customer. It made a single assembly module work for all the many configurations and timings they required. Unfortunately their CEO was concerned about "the program memory loosing the code" and the project languished... until their major competor came to us asking us to design them a solution.If i have to use CD4060 and some components, i could easy make a Microcontroller and a transistor, less components.
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