master.sys.xp_DirTree

I have 25,000 subfolders under parent directory. when i try to run following query it will not display any folders with 25,000 subfolders but i  run with 2000 subfolders it displays all the subfolders. is there any limit on the subfolders to use below query. Any help much appreciated

EXECmaster.sys.xp_DirTree'maindirectorypath’

Thanks,