As for how long the yen differential lasts... it really depends on just how cowed the BoJ is.
While Abe is taking a short term look at the situation, the BoJ is looking at a larger longterm issue which is their aging population, compounded by the fact that their aging population tend to work even past their "mandatory" retirement age.
Meaning less and less money will be able to finance their debts... which could spiral and REALLY lower the Yen's value.








