Snowden could spend up to six months in Sheremetyevo airport- official
"He could stay in Sheremetyevo until his legal status is determined. The legislator has set the timeline of up to three months but the procedure could be extended for another three.
So he could be in the transit area for up to six months," Volokh said. Volokh is former Federal Migration Service deputy head.
Voice of Russia, Interfax