Our tent sidewalls come in 20' lengths.  Recomended for spring and fall weddings.   For easy calculations see below.  This is how many walls you will need to fully inclose your tent.  
TENT SIZE:  32'x30' tent needs 5 walls         or         3 walls for partialy closed
                         32'x50' tent needs 7 walls         or         4 walls for partialy closed
                         32'x70' tent needs 9 walls         or         5 walls for partialy closed
                         32'x90' tent needs 11 walls       or         7 walls for partialy closed