Interestingly, Daniel says that 1290 days (=43 years) pass after the abomination of desolation, but he doesn't say until WHAT. So perhaps the abomination of desolation lasts that long and we can hope that it will be removed from us on August 22, 2011 (Feast of the Immaculate Heart of Mary).
Or else something else begins on August 22, 2011 that will last until February 11, 2013, a chastisement.
Based on correlating it with Catholic prophecy, here's one possible scenario.
Beginning August 22, the Chastisement beings, leading eventually to the deaths of Benedict XVI and most of his cardinals. If you follow Father Gruner that the secret revealed by the Vatican was only part of it, Benedict XVI may himself literally live out the vision. Perhaps as he's going up the hill he can recall the false interpretation of that secret which he put out (along with Sodano and Bertone). There will be a terrible war, and plagues, and famine--and incredible chaos and death during this time. Eventually a Great Monarch emerges, a Holy Pope is elected (designated by Sts. Peter and Paul), that Pope and the bishops consecrate Russia to the Immaculate Heart of Mary (many prophecies foretell Russia as the instrument of this Chastisement, and as overrunning Europe, destroying the Vatican, etc.) As a result of this consecration, the Three Days of Darkness comes to wipe out the major enemies of the Church (perhaps around Christmas time 2012?), and the tide turns so dramatically and miraculously as a direct and obvious result of the consecration, that many come to believe in the True Faith as a result, and by February 2013 a new Christendom becomes established around the world.