[GRASSLIST:2007] r.watershed forever

Hi,
r.watershed seems to run forever,
after 87 hours of process the cpu carge is still at 99 %.

Data displayed by the program:

segments in row: 52
segments in columns: 30
total segments: 1560
open segments: 213

program is now processing section 5:

SECTION 5 beginning: Closing Maps.

Any idea?

Thanks Michele.