Even very thick jeans can be dried within 7 hours even though it has been raining for days outside. Less thick/regular clothes take only 3 to 4 hours. It is difficult to find space to hang out huge bed sheets and blanket covers in most flats. But I hang them onto rods inside my bathroom and they are dried within 3 to 4 hours and can be packed into wardrobes immediately.
Extremely useful - the bathrooms are also kept very dry .... no more mould or whatever.....
Hard to say .... depends on your needs.... Usually the more space to hang clothes the better. My 客廁 is in fact bigger because the toilet cabinet there is smaller and it is a smaller 企缸 too. But I have the Drymaster in 主人套廁 because there is a 浴缸 there and I 浸浴 every day and so there is a lot of moisture. I want to keep the bathroom dry also apart from drying clothes and so I have Drymaster in 主人套廁.
Really hard to say, depending on families' needs....