Википедия пишет, что одну неделю. http://ru.m.wikipedia.org/wiki/Чеченский_конфликт#.D0.9F.D1.80.D0.BE.D0.B2.D0.BE.D0.B7.D0.B3.D0.BB.D0.B0.D1.88.D0.B5.D0.BD.D0.B8.D0.B5_.D0.BD.D0.B5.D0.B7.D0.B0.D0.B2.D0.B8.D1.81.D0.B8.D0.BC.D0.BE.D1.81.D1.82.D0.B8