Posted by robin on Saturday, January 26, 2013 at 3:52pm.
3 pumps ----> working 6 hours --- 2 days
6 pumps ----> working 6 hours --- 1 day
1 pump -----> working 36 hrs ---- -1 day
9 pumps ----> working 4 hrs ------ 1 day
or
it takes 18 pump-hrs running for 2 days
it takes 36 pump-hrs to do it in 1 day
so 9 pumps would take 4 hrs to do it in 1 day
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