That should not be anywhere on your list of reasons to apply or not to any particular programs.
You can expect to be at the hospital minimum 8 am to 5 pm M-F, with occasional weekend work. You may need to stay later or come in earlier depending on patient and attending demands.
IF you get out early on a given day, it's a bonus. Go home and read. Or go out and jog and then read later. Don't count on it. If it is a regular thing, your residency is failing you in it's mission to train you. 40 hours/week x 50 weeks/ year x 4 years = 8000 potential hours of learning and experience, which isn't enough to be a good doctor. That will make you an ok doctor, one safe enough to treat easy patients.
No one wants a residency with scut work or long hours of busy work. But if you compare it to IM with 60 + hours at the hospital per week, and surgery at 80 +, you have nothing to complain about. My hardest rotation was SCI - one rehab resident, 7 am - 6 pm M-F + rounds saturday and Sunday. We all complained about it endlessly. A few months of the year we had a urology resident with us. The one I had with me found the hours made it like taking a vacation. He would have done an extra month if he could. It's all about perspective.
Also know that it will vary within a program and by attending. I had attendings let me go when I was done for the day, others required me to stay until they left or dismissed me. One got upset when she found me studying outside, as I was not on the ward.
If hours are what you are after, wait until you are done with residency and the amount you get paid varies directly with how many huors you work. Then you decide how much you want to work. Until then, put in as many hours as you can learning, and the best learning takes place at the patient's bedside. Sounds cliche, but it is more true than you can imagine.