Rules vary depending on where you live, but generally the main disconnect is supposed to be "as close as possible" to the meter. I assume the disconnect is on the outside of your house? I know they do that often in southern states but it's not very common elsewhere.
You can probably find some good information on the website of your local electric utility - nowadays most of them have an installation guide or manual online, it may be able to tell you what the maximum allowed distance is.
