Add warning note in man page that overwrite may take a long time to
execute.

Suggested-by: Robert Elliot <elli...@hpe.com>
Signed-off-by: Dave Jiang <dave.ji...@intel.com>
---
 Documentation/ndctl/ndctl-sanitize-dimm.txt |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/ndctl/ndctl-sanitize-dimm.txt 
b/Documentation/ndctl/ndctl-sanitize-dimm.txt
index 797820dd..ebf4b995 100644
--- a/Documentation/ndctl/ndctl-sanitize-dimm.txt
+++ b/Documentation/ndctl/ndctl-sanitize-dimm.txt
@@ -49,7 +49,8 @@ include::xable-dimm-options.txt[]
        Wipe the entire DIMM, including label data. This can take significant
        time, and the command is non-blocking. With this option, the overwrite
        request is merely submitted to the NVDIMM, and the completion is
-       asynchronous.
+       asynchronous. Depending on the medium and capacity, overwrite may take
+       tens of minutes to many hours.
 
 -m::
 --master_passphrase::

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