Some hospitals would put up roadblocks to a timely review of your chart, others would not. When I was a DPOAHC for a dying friend (at a Kaiser facility--and not, that is not what killed him), I had no trouble reading his chart. The nurses were so busy with their 1-10+ staffing and were glad that I was doing most of his care, that they just pointed to the chart on their way by.
Keeping up on it was how I noticed, for example, that the night nurses weren't giving him his night antibiotics, since they had to be crushed up and given with applesauce and they simply did not have the time.
So, when I came in in the morning, I'd review whatever meds had been missed and give those that would be useful, since I had the time. It's also how I knew he hadn't simply slipped into a coma one night, when I noticed that a nurse had given him a VERY large dose of MS to keep him quiet and free from agitation (he was out for over 24 hours--it did him a lot of good). (I had left orders that he was not to experience the sensation of pain, so there was no limit on the amount of MS that could be given.)
If there's no rush, the easiest thing to do is to request your own copy of your chart from the Records Department, as I usually have done. Also I have copies of xrays, MRIs, etc. They can charge you so much a page to do the coyping (and it cost me about $9 per xray sheet after the first set of copies), and it may take a week or so.
Having your own copies of everything makes it very easy to get second opinions, attend appointments with no chance of hearing "they didn't send up your chart," etc.
Besides simple misunderstanding of the data, one of the reasons facilities want viewing of an actual chart to be supervised by an employee, is so that people can't just remove items and pages they don't happen to like or that they want to have for themselves, or write in stuff pretending to be employees, etc.
Doesn't it seem strange, or at least redundant, to anyone but me that some, not all, facilities require a release of information to give this data to the patient who requests it? Duh!