What is the speed of your FC?
Will the same FC be used for both the source and target of the DUPMEDBRM,
if so, that will lengthen the time required.
Here are some performance numbers from 2016 of my LTO5 to LTO7 migration,
using 8gb FC on a P7.
A full LTO5, 3tb compressed, 280mb/sec.
A full LTO6, 6.25tb compressed, 400mb/sec
A full LTO7, 15 tb compressed, 700mb/sec
DUPTAP of a full LTO5 to LTO5 volume previously was 10 hours.
DUPTAP of a full LTO5 to LTO7 volume is 4 hours 45 minutes.
DUPTAP of a full LTO7 to LTO7 volume is 18 hours.
Your process should take 4 to 5 LTO6 volumes, each volume about 10 hours,
so about 40 hours total.
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