The problem with having a dog spend all of it's time with you and have it follow you all over the house is that when a time comes for it to be left because you can't take it with you or whatever, that dog is much less likely to be able to cope with being left because it simply is not used to it and such dogs are most likely to fret and suffer anxiety when left alone.
We never had any of our pups follow us all over the house and we haven't had any problems from not being able to see them every second of the day. In fact, sometimes dogs will only act in a certain undesirable ways when there are people there for them to get the attention of. I knew somebody who's pups started to delibertaly chew the table just to get attention. Obviously, she didn't do this when they weren't around. When they were, she'd do it just to get a reaction out of them and when they went to tell her off, she'd just move around the other side of the table and carry on doing it....obviously too used to getting too much attention and didn't like it when they took their attention of her for even a second...like when they watched TV or talked on the phone. With my advice, they managed to correct it and she no longer does this.

The reason I disagreed is because having CIAO have the pup sleep in the bedroom with them could just make this problem worse, not better. In many cases it does make the problem worse and I know people who fell for this same thing and it only got worse and I told them why. The only way a dog can be used to spending time alone is if it gets to spend time alone...not constantly under the owners feet or on their lap.
Obviously, if top dog behaviourists like John Fisher and Peter Neville, and these are who most of the behaviourists in the U.S learnt their stuff from, are saying what I am, I'll go by them rather than somebody who says you should give in to the dog and let it sleep in your bedroom with you because it's the easier option in the short term.

CAIO - I don't think there is any set amount of time to have her in her fenced off area. I think the main time would be times when she is naturally tired and needs to rest but I suppose she'll also need to go in there to keep her out of the way when the house needs tidying or maybe when visitors come etc.... If she is really tired and sleeps in there without problem as a result, she'll gradually get used to spending a bit more time in there even when she's awake but always still with plenty of opportunities to be let out and explore, run about and play etc...
As others have stated, provide her with things to do in her fenced off area. Also, instead of her seeing her fenced off area as a prison, teach her to view it as a safe haven. Somewhere she can retire to when she's tired or had enough. Let her still have access to it even when she's free. If she knows it is somewhere thats not just a prison, she'll start to enjoy it more in there. Thats why people often leave crate doors open for dogs to use even when they are allowed to free roam the house and the dogs are encouraged to use it as a bed before they are taught to be closed inside it so they already view it as a haven beforehand.