There is no time-limit for this quest and no reward!
Please note that the times for certain objects may vary, they depend on the quality (star level).
Last checked on Family Furnishings update (July 2019)
I have closed the comments for this post, if you are having trouble, please use the unofficial forum, there are many people there who can and likely will answer your questions: http://simsfp.perturbee.net
Technical support (if your game does not work as expected, like no goals, no building options, crashes and such) use: https://firemonkeys.zendesk.com/
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Based on a work at http://simfsfp.blogspot.com.