I have 4 ADSL UTP cables.
How much distance do I need to leave between cables to avoid crosstalk?
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Alien crosstalk (AXT) really depends on a lot of things. The cabling materials matter most. Different cables have different tolerance agains crosstalk. Mostly it won't hurt the performance of those cables significantly by installing each cable a few inches away from each other.
Try to install them side by side first and see if the performance degrades. Moving them away 2 inches or more should probably eliminate significant amount of crosstalk if the performance degrades when the cables are placed directly side by side.