How Long Can a Telephone Extension Cord Be?

Recently, at a Radio Shack store at the telephone accessories section, I noticed that telephone extension cords were available in lengths up to 25 feet (but I didn't notice any that were longer). Is that because 25 feet is the longest you can go before there's a significant loss of signal strength?

And what about people who access the internet via 56K dial-up? For them, how long can the extension cord be and still have "clean" transmission for error-free downloads?

[TELECOM Digest Editor's Note: I do not know what the rule is -- if any -- regarding the length of cords, but I do not think it has to do with any signal degradation; after all, you might be _miles_ from the central office building, or in the case of a DSL connection, up to several thousand feet. PAT]
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