Saving money is related to the size of the bedroom.
3: Summon level ≤ Master and meet "(player level-Summon level) ≤30+ player level *30%.
There is no time limit, only the number of physical needs.
5. In addition to resting in the bedroom, refer to the second answer.
6. You didn't decide the geomantic omen of the house. If you hire someone to do it, they generally know that when you do it yourself, you should pay attention to the equipment you bought when building a house and summon animals. These must be interrelated and mutually assured.
There is only one servant. I think you are asking about the servant room. The number of servant rooms controls your daily rest time!