Like Boxielover stated, your friend's turtles would probably become alot more active if they were moved outside, or at least given more room. Unless you have a basis for comparison, it can be hard to tell if a turtle's behavior is 'fine'.
As an example, years ago, I had to house one of mine indoors over the winter because he was recovering from an ear infection: he seemed fine all those months, but boy, when I put him in the outdoor pen in the spring, he had a completely different personality. He became MUCH livelier: the difference was huge.
Now, if any of my turtles have health problems that require that they stay indoors, I make every effort to make that stay as brief as possible, because they tend to get stressed.
Another consideration is expense: our indoor 4'x8' infirmary setup cost us as much as our 750 sq. ft. outdoor enclosure!
I really would reconsider a box turtle as a pet if you can only provide indoor housing with limited space.

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• Indoor Enclosure Size? - Grunngg, Sat Jun 24 02:14:59 2006
• RE: Indoor Enclosure Size? - tmdank, Sat Jun 24 08:25:18 2006
• Where to begin.... - StephF, Sat Jun 24 09:34:54 2006
• RE: Where to begin.... - boxielover, Sat Jun 24 15:55:03 2006
• RE: Where to begin.... - Grunngg, Sat Jun 24 21:57:06 2006
• RE: Where to begin.... - boxielover, Sat Jun 24 23:52:52 2006
• RE: Where to begin.... - StephF, Sun Jun 25 09:03:09 2006
• RE: Where to begin.... - Rouen, Sun Jun 25 12:35:35 2006
• RE: Indoor Enclosure Size? - StephF, Sat Jun 24 08:29:25 2006
• RE: Indoor Enclosure Size? - Grunngg, Mon Jun 26 00:36:25 2006
• RE: Indoor Enclosure Size? - streamwalker, Mon Jun 26 07:21:02 2006
• RE: Indoor Enclosure Size? - Grunngg, Mon Jun 26 22:52:56 2006
• RE: Indoor Enclosure Size? - streamwalker, Tue Jun 27 06:22:41 2006
• RE: Indoor Enclosure Size? - boxielover, Tue Jun 27 18:27:46 2006