RE: The Ferryland iceberg photo posted by Bairgon...
... 46 m highest point ...
and
That is just the 10% above the water!
true, while the base under water is most probably wider similar to tree roots, else it's getting ready to topple :-)
If that was sea ice, rather than a chunk of calved glacier, AND ...
if the Lebedev formula for ice growth still had some skill over such an extreme range, then ...
if we said it had an average thickness of ~ 400 metres, then ...
the number of Freezing Degree Days necessary would be approximately 50 million.
That would just require a temperature of -50 degrees Celsius, for about 27 or 28 centuries.
Even I might be prepared to accept a small wager that such a prolonged cool snap is not on the immediate horizon.