Here is the computed spread of water across the globe after 5 days (left) and 6 days (right):
and a temporal view:
The authors say this amount of melting is the equivalent of 3,150 Gt/yr of ice melt; recent ice loss from Greenland is about 179 Gt/yr.
The Missoula Floods that created the Washington (state) Scablands were estimated to be 9 cubic miles an hour, which is 10 million m3/sec, or 100 times the rate in this paper.
By way of comparison, the average discharge from the Mississippi River is 17,000 m3/sec;
from the Amazon River, 209,000 m3/sec;
from all rivers worldwide about 1 million m3/sec (= 1 Sverdrup).
It takes about 55
The volume of one of the World Trade Center towers was 1.7 million m3;
the volume of the interior of the New Orleans Superdome is 3.5 million m3.
(Lorbacher et al, JGR-Oceans, 2012)