5.38 TiB / 5.65 TiB [===========================================================================================================================>------]  95.14% 4h26m35sError: unexpected EOF

real	5247m31.386s
user	342m44.012s
sys	652m22.150s
Close, but no cigar. The slowdown I've seen towards the end was likely due to swappiness (1 GB swap). So, as a rule of thumb I'm going to assume 1 GB RAM for 1 TB pinned.