If they orbit within the Oort cloud, they are between 5,000 and 100,000 times farther away from the sun than we are. That makes the orbital period, very roughly, something like 5,000 to 100,000 years.
39 posted on 01/15/2015 4:20:57 PM PST by muir_redwoods
("He is a very shallow critic who cannot see an eternal rebel in the heart of a conservative." G.K .C)