Just for the record, the calculation time;

> GRASS 6.4.2svn (patUTM32):~ > r.watershed italy_dem20_final
> stream=stream_total accumulation=accumulation_total threshold=10000 -m
> memory=2000

(cells: 364 million)

GRASS 6.4.2svn: done in two hours.

GRASS 7,svn, on the same machine: 36 min :)

Markus
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