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In LispWorks (64-bit) for Windows and LispWorks (64-bit) for Macintosh the size of the range is #x3c000000000 (3.75TB). Since these platforms properly support reservation, there should not be any reason to change the range. The only time when this is needed is when other software insists on using some address in this range and does not relocate automatically.

LispWorks User Guide - 11 Mar 2008