NW6.0 sp5
I had the following error this morning

9 Aug 2005 6:15:25 NSS<COMN>-3.5-xxxx: comnPool.c[2495]
Pool GROUPWISE: System data error20012(beastTree.c[504]. Block 67229308
(file block -67229308) (ZID 1)
Should I do a rebuild or verify ?
The volume has my Groupwise data .The size is 250GO, around 50Go in use.
Any idea how long the rebuild or verify could take (if that is the
solution )?So that I can warn my warn my users of the down time